On RSV it's a minimum of 3:54 minutes per day. Line holders are either protected to either their line value for the month, minimum line value (72), or what they actually fly, whichever is greater.

Examples: awarded line worth 65 hours. Due to weather you have 2 days cancel (loss of 7 hours flying). You then complete rest of month with about 58 hours of flying. Your pay is for 72 hours.

Same example except now line is worth 85 hours. You will be paid for 85 hours.

More creative pay buffering. You are awarded a CDO line with 32 hours of flying (Guarantee of 72 hours). You drop 4 days (2 CDO's) each worth 2.5 hours each. You then pick up 4 day OT trip worth 15 hours. You now get paid 72-5+15=82 hours with 15 hours paid at 150% or 200%.

Trip/duty rigs would be nice because it would force them create more efficient trips or pay us more.