Update README.md

Author: spruce

README.md

@@ -11,3 +11,9 @@
 1. run `node transport`
 
 
+## Import limit
+Because Github has a limit of 5000 Api requests per hour one has to watch out that one doesn't get over this limit. I transfered on of my project with it ~ 300 issues with ~ 200 notes. This totals to some 500 objects excluding commits which are imported through githubs importer. I never got under 3800 remaining requests (while testing it two times in one hour).
+
+So the rule of thumb should be that one can import a repo with ~ 2500 issues without a problem.
+
+