It really depends on your bub and how much sleep he needs. Abby's always been on the long end of sleep - and she still loves a 12 hr night. But I know other bubs who are fine with an 11 hr night. At this age, the A times begin to get quite long, and the naps are still longish, so lots of bubs are doing more of a 13 hr day just to get all the spacing right. And yes, if he's waking at roughly the same time each day, then his naps will be at about the same time (since the A time will be the same) - until he starts to move to one nap, then everything changes - but it's a bit early for that to start, I think - most bubs start between 10 - 11 mos (so you have few weeks at least!)