Figuring out how a rotation actually gets credited is almost at the doctoral level and most definitely requires some rocket surgery. 😆

The easy ones are when you look at a rotation and the total credit (far left number, "TL") equals the second number (block time, "BL") because you are simply getting paid for what you fly or when total credit equals the respective multiple of the Average Daily Guarantee (i.e., 10:30, 15:45, 21:00, etc). It is when the "TL" number is greater than the ADG and the third number from the left ("CR") has a value that it gets a bit more cosmic. What is even more fun to figure out is when two forms of credit combine. It is possible that the TL can be comprised of both trip credit (1 hour of pay for each 3.5 hours you are away from base) and a duty period credit (1 hour of pay for every 2 hours you are on duty) for a certain day...or, as discussed in this thread, night duty.

And, don't forget that deadheading is a 1:1 credit so, even though it shows up under the third number ("CR"), it is treated like the second number ("BL").