Need a little help with some payback day math from the end of last month. I think the co is not doing it correctly, but it was last month and now I need to do something extra I guess.

Near the end of the month (June), I had

28: PB
29: PB
30: PR (ending at 0730)
1: RES

I did a two-day GS on 28/29 that blocked in at 1600 on the 29th.

By my math, I calculate that I'm owed 2 banked PB days. They're saying it's only one.

I think there's another school of thought that would actually say there are 3 banked PB days due - if you instantly convert the PR on the 30th to a PB, and then add 9 hours from there.

What's the consensus?