MQ is 10 pilots per airframe (5/5 CA/FO, slightly slipping on the CA side lately. Woohoo critical coverage for the most of August on the CA side), at least on the CRJ. With that said, about 40% of the pilot group sits reserve. I had a reserve overnight where me and the CA deadheaded out in the morning for one leg back in the next day - found out the FAs got deadheaded out a day prior and were just sitting there. I had an overnight that started 8pm and had 9.5 hr block for 25 hrs tafb (I really like that second kind of an overnight better). 50/50 crapshot.
As of yesterday, only 8 FOs of almost 40 on the reserve list flew more than 30 hrs in July.
PS Quoted a wrong post, too lazy to change