Hi John,
You might be experiencing a a Java Heap Size limitation.
Try increase the Heap size and test it!
Hi John,
How many columns do you want to import? Hours definitely seem to be off. What is your excel import setup? Are you utilizing a staging entity and create a new entry for each row? Or is your template configured in a way that has a direct DB sync and maybe more than one key?
Are you using custom import microflows for date time or something similar?