I'm trying to set up a script that tracks he history of changes to a record, and it's very dependant on the "ModifyTime" field being accurate, to the second, but it only updates periodically, like every minute or so. Is there any step that I can add to the script that will make sure it's updated? "Refresh Window" doesn't do it.

Exit Record should do it.

If the exact time is critical, make sure all the user's computer clocks are synchronised.