To clarify, using a rolling Thunder example where all my X-days are stacked at the beginning of the month and I’m flying GS on my X-days...

My initial reserve days start on a Monday. Let’s say GS #1 results in a full PB day on Monday & Tuesday with a PR on Wed until 0800.

Then, I pickup an identical GS trip.

How is that calculated? Is the 2nd GS (2PBs and 8hr PR) added to the Wed 0800 reserve start time from the 1st GS? Or, is Wed made a whole PB, then the 2nd GS calculated from midnight on Thursday?