diff --git a/packages/react-native/ReactAndroid/api/ReactAndroid.api b/packages/react-native/ReactAndroid/api/ReactAndroid.api
index fb02f33c4eb0b5..1ddf3d0d0101be 100644
--- a/packages/react-native/ReactAndroid/api/ReactAndroid.api
+++ b/packages/react-native/ReactAndroid/api/ReactAndroid.api
@@ -1798,16 +1798,6 @@ public final class com/facebook/react/common/LifecycleState : java/lang/Enum {
 	public static fun values ()[Lcom/facebook/react/common/LifecycleState;
 }
 
-public class com/facebook/react/common/LongArray {
-	public fun add (J)V
-	public static fun createWithInitialCapacity (I)Lcom/facebook/react/common/LongArray;
-	public fun dropTail (I)V
-	public fun get (I)J
-	public fun isEmpty ()Z
-	public fun set (IJ)V
-	public fun size ()I
-}
-
 public class com/facebook/react/common/MapBuilder {
 	public fun <init> ()V
 	public static fun builder ()Lcom/facebook/react/common/MapBuilder$Builder;
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/LongArray.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/LongArray.java
deleted file mode 100644
index 30e4321c964d5a..00000000000000
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/LongArray.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-package com.facebook.react.common;
-
-import com.facebook.infer.annotation.Nullsafe;
-
-/** Object wrapping an auto-expanding long[]. Like an ArrayList<Long> but without the autoboxing. */
-@Nullsafe(Nullsafe.Mode.LOCAL)
-public class LongArray {
-
-  private static final double INNER_ARRAY_GROWTH_FACTOR = 1.8;
-
-  private long[] mArray;
-  private int mLength;
-
-  public static LongArray createWithInitialCapacity(int initialCapacity) {
-    return new LongArray(initialCapacity);
-  }
-
-  private LongArray(int initialCapacity) {
-    mArray = new long[initialCapacity];
-    mLength = 0;
-  }
-
-  public void add(long value) {
-    growArrayIfNeeded();
-    mArray[mLength++] = value;
-  }
-
-  public long get(int index) {
-    if (index >= mLength) {
-      throw new IndexOutOfBoundsException("" + index + " >= " + mLength);
-    }
-    return mArray[index];
-  }
-
-  public void set(int index, long value) {
-    if (index >= mLength) {
-      throw new IndexOutOfBoundsException("" + index + " >= " + mLength);
-    }
-    mArray[index] = value;
-  }
-
-  public int size() {
-    return mLength;
-  }
-
-  public boolean isEmpty() {
-    return mLength == 0;
-  }
-
-  /** Removes the *last* n items of the array all at once. */
-  public void dropTail(int n) {
-    if (n > mLength) {
-      throw new IndexOutOfBoundsException(
-          "Trying to drop " + n + " items from array of length " + mLength);
-    }
-    mLength -= n;
-  }
-
-  private void growArrayIfNeeded() {
-    if (mLength == mArray.length) {
-      // If the initial capacity was 1 we need to ensure it at least grows by 1.
-      int newSize = Math.max(mLength + 1, (int) (mLength * INNER_ARRAY_GROWTH_FACTOR));
-      long[] newArray = new long[newSize];
-      System.arraycopy(mArray, 0, newArray, 0, mLength);
-      mArray = newArray;
-    }
-  }
-}
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.kt b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.kt
index 01424ae7d3bc76..b8dec0416df99a 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.kt
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.kt
@@ -8,7 +8,6 @@
 package com.facebook.react.modules.debug
 
 import com.facebook.react.bridge.NotThreadSafeBridgeIdleDebugListener
-import com.facebook.react.common.LongArray
 import com.facebook.react.uimanager.debug.NotThreadSafeViewHierarchyUpdateDebugListener
 
 /**
@@ -19,10 +18,10 @@ import com.facebook.react.uimanager.debug.NotThreadSafeViewHierarchyUpdateDebugL
  */
 internal class DidJSUpdateUiDuringFrameDetector :
     NotThreadSafeBridgeIdleDebugListener, NotThreadSafeViewHierarchyUpdateDebugListener {
-  private val transitionToIdleEvents = LongArray.createWithInitialCapacity(20)
-  private val transitionToBusyEvents = LongArray.createWithInitialCapacity(20)
-  private val viewHierarchyUpdateEnqueuedEvents = LongArray.createWithInitialCapacity(20)
-  private val viewHierarchyUpdateFinishedEvents = LongArray.createWithInitialCapacity(20)
+  private val transitionToIdleEvents = ArrayList<Long>(20)
+  private val transitionToBusyEvents = ArrayList<Long>(20)
+  private val viewHierarchyUpdateEnqueuedEvents = ArrayList<Long>(20)
+  private val viewHierarchyUpdateFinishedEvents = ArrayList<Long>(20)
   @Volatile private var wasIdleAtEndOfLastFrame = true
 
   @Synchronized
@@ -106,53 +105,42 @@ internal class DidJSUpdateUiDuringFrameDetector :
       wasIdleAtEndOfLastFrame
     } else lastIdleTransition > lastBusyTransition
   }
+}
 
-  companion object {
-    private fun hasEventBetweenTimestamps(
-        eventArray: LongArray,
-        startTime: Long,
-        endTime: Long
-    ): Boolean {
-      for (i in 0 until eventArray.size()) {
-        val time = eventArray[i]
-        if (time in startTime until endTime) {
-          return true
-        }
-      }
-      return false
-    }
+private fun hasEventBetweenTimestamps(
+    eventArray: ArrayList<Long>,
+    startTime: Long,
+    endTime: Long
+): Boolean = eventArray.any { time -> time in startTime until endTime }
 
-    private fun getLastEventBetweenTimestamps(
-        eventArray: LongArray,
-        startTime: Long,
-        endTime: Long
-    ): Long {
-      var lastEvent: Long = -1
-      for (i in 0 until eventArray.size()) {
-        val time = eventArray[i]
-        if (time in startTime until endTime) {
-          lastEvent = time
-        } else if (time >= endTime) {
-          break
-        }
-      }
-      return lastEvent
+private fun getLastEventBetweenTimestamps(
+    eventArray: ArrayList<Long>,
+    startTime: Long,
+    endTime: Long
+): Long {
+  var lastEvent: Long = -1
+  for (time in eventArray) {
+    if (time in startTime until endTime) {
+      lastEvent = time
+    } else if (time >= endTime) {
+      break
     }
+  }
+  return lastEvent
+}
 
-    private fun cleanUp(eventArray: LongArray, endTime: Long) {
-      val size = eventArray.size()
-      var indicesToRemove = 0
-      for (i in 0 until size) {
-        if (eventArray[i] < endTime) {
-          indicesToRemove++
-        }
-      }
-      if (indicesToRemove > 0) {
-        for (i in 0 until size - indicesToRemove) {
-          eventArray[i] = eventArray[i + indicesToRemove]
-        }
-        eventArray.dropTail(indicesToRemove)
-      }
+private fun cleanUp(eventArray: ArrayList<Long>, endTime: Long) {
+  val size = eventArray.size
+  var indicesToRemove = 0
+  for (i in 0 until size) {
+    if (eventArray[i] < endTime) {
+      indicesToRemove++
+    }
+  }
+  if (indicesToRemove > 0) {
+    for (i in 0 until size - indicesToRemove) {
+      eventArray[i] = eventArray[i + indicesToRemove]
     }
+    eventArray.dropLast(indicesToRemove)
   }
 }