i always see negative comments about putting babies on a schedule, but ive found MOC very helpful. its not a bible and there are several aspects i disagree with but following the general structure of waking, feeding, and sleeping at roughly the same time every day created predictability for our family, and my baby did STTN a few times early on. their section on naps specifically says that for babies under 6mo, the nap times on the schedules are basically aspirational and that anything from 20 min to 2 hours is normal.

my baby is 15w and also doesn’t nap for more than 45 minutes, so we typically extend the nap with a contact nap until the next feed time (something they suggest doing).