Originally Posted by SMACFUM

Example: You show up to work at 8am on day 1 for a 4 day trip. You finish your trip on day 4 at 14:00. You have a TAFB of 80 hours. Now, that trip you may only fly (and get paid for) 16 hours. With the 4:1 TAFB rig you are guaranteed a min of 20 hours of pay. 4:1 or 80:4 = 20