I've got so used to 6 monthly sim checks and OPC's on two different types, plus two annual line checks and safety certs that I just carry it into my private flying and twice a year fly with an instructor for a brush up. I always learn something and always enjoy it.
My employers have a policy that after 2 weeks away a pilot goes to the aircraft early and just quietly re-famils with his office. A month away would mean a line flight under supervision and 90 days a brief check with TRE/IRE and those rules are for pilots flying 500-700 hours a year.
Back to the OP: the 28 day and 90 day stats were for commercial ops to show fatigue or lack of currency. When I appeared in one of those reports me (the P1) on the flight had 3 700 hours, the P2 (who was the company Chief Pilot had
21 340 hours of which 18 900 were on type!
SND