I can sympathize completely. For me, I think we have two problems. One, DS is touchy when it comes to naps I think. He wakes easily and always seems to want to know what's going on, so won't go back to sleep. It is frustrating, because I know through APing that he can happily take a 2hr nap and has no problem transitioning through cycles, but I really struggle get him to nap for a long time in his crib. I know this because if I nap with him (which I have to admit happens on occasion as sometimes I feel so exhausted it's the only way either of us get caught up on sleep) he can sleep for 2hrs without a peep. The longest I get these days is 1hr 20mins, and that's if I'm lucky.
Generally going down for naps is not a problem, but somewhere along the way he wakes and wants something, I don't know what (me I guess). I have tried extending the naps if they are under 45mins, sometimes it works but he'll never sleep for longer than 30mins after I extend, then he wakes again. Sometimes I wonder if I should try to extend after 1hr 20mins, seeing as how I know he could sleep longer, but I just figure that's sufficient enough and get him up. If I could get 2x1hr 20min naps a day I'd be happy.
Two, I know I am not consistent enough. I go by the clock and by his cues, so no two days are ever the same in terms of A time. Plus, I do like to be out and about a few times a week, so the afternoon's are usually tough because that's when we got out, and it makes it hard to be consistent. I'm sure I'm the bigger part of the problem.
He gets about 2-2.5 hrs naps a day (2.5 is on a really good day). I would like it to be about 3. But at least he is happy and is a really content and easy going baby, so that's make it much easier to deal with. It just keep telling myself, he'll nap better one of these days.