In New England it's a 20 minute bonus after 10 hours. It's not a break...it's a 20 minute time bonus added to your total for going over 10. It was to take place of forcing someone to sit out there even longer to get the added break in.
This varies by supplement. In the New England Supplement, an employee gets a 20 minute time bonus paid at the overtime rate if they work 10 hours. We used to get a paid 20 minute break after 10 hrs but that was changed in the 90's. We still get the 20 minutes pay, we just don't have to actually take the actual break any more.