Insert integration time in the progress bar

[nilodna]

Updating progress bar description to show the `integration time. fixes #2149

[VeckoTheGecko]

Just wondering why there is the need for the isinstance checks here as well as the second statement?

Is the second statement because this doesn't show on the first loop?

[nilodna]

Just wondering why there is the need for the isinstance checks here as well as the second statement?

I wasn't sure where exactly in the code time is checked for datetime64/timedelta64, so I'm checking it. Going through the code right now I found where this check is done, so I'll delete this conditional statement.

Is the second statement because this doesn't show on the first loop?

Yes! It is just to initialize the progress bar with the same size.