Is it possible to enter more than 24 hours a day as a time record in Core?
Yes, you can enter as many hours as you want in Core, even exceeding 24 hours in a day. There is no limit on the number of hours entered per day.
Note: If you are a QuickBooks user, you cannot send more than 24 hours per day from Core to QuickBooks Online. That is a QuickBooks limitation, not Core.