MaxAlt.
Dont know if you are tongue in cheek or not.
However, somewhat simplistically:
"Pay hours". Basically block hours, but can be over-ridden in a given rotation by several factors (rigs). ( Rigs are usually applied to both duty time and committed time)
Duty time rigs range from about 1.75 to 1 to 2.5 to 1. Divide DT by rig to get pay hours.
Committed time rigs range from 3.5 to 1 to 4 to 1.
Divide CT by rig to get pay hours.
Multiply the min.guarantee hours by the hourly rate to get basic "monthly" pay. (Even if you only do 50 pay hours you get paid the min guarantee.)
A "month" could be either a calendar month or a 28 day month.
Your effective hourly rate could be from very low hours or very high pay. Hope its the latter!