For example:
FLL-ORD-FLL= 3.5 each way for 7 hrs total.
ORD-RSW-ORD= 3.25 each way for 6.5 total.
If it was a turn the crew would get 7 (or 6.5) hrs for the day. If they did it 3 days in a row they would credit 21 (19.5) hrs.

What is happening now is a 3 day trip for the FLL crew:
Day 1: FLL-ORD for 3.5
Day 2: ORD-RSW-ORD for 6.5
Day 3: ORD-FLL for 3.5
total 13.5 hrs for 3 days of flying because we have no true min day, only trip averaging.

All they have to do is keep the rotation of pilots every day and the flights get covered at a lesser cost than 3 days of turns for both cities. And crews are now on overnights instead of home every night. Hotels cost less than a pilot costing 6 extra hours over the same days. I hope that is less confusing than it looks.

*disclaimer- the flight times may or may not be accurate. For illustration purposes only. Not for navigation.