Mandy, I wouldn't put a timescale on it honestly. It's not like x number of hours of sleep reduces OT by x% yk? It might just take one good long night to get back on track, or a few days. For example, last month we went away (flights, different time zone, crazy days), and it took a full week of extra long nap and nights before DD was back on her normal routine. Then today she skipped her nap
(boo, I am totally not ready to be starting the 1-0!), so I put her to bed at 6 and I expect she will do a long night and be fine tomorrow. She's older so it's easier to deal with OT, but my point is it just depends how tired they are and it's difficult to measure! You'll probably be able to tell when he's caught up as he'll likely seem happier and be able to up the A time again.
You are not being obnoxious, this is what the forum is for and there are plenty of people willing to help! Has your DH seen any of the CIO info on here? Hugs, it's hard when you're not on the same page and especially when you're sleep deprived