How often and long are your babys naps?

I'm lucky if I can get an hour or more out of my baby for naps. He struggles with napping in his crib. I can get 15 min out of him in there after a struggle to put him down. He sleeps well on his boppy on the couch, but I'm trying to break that habit. He will nap about 4 times a day for under 30min... If I'm lucky I may get an hour / hour and a half on the boppy on occasion but that's only in the morning.

Any suggestions on helping with nap time? I try to make it every 2 hours but it doesn't always work out.