Naps and feeding times

My baby is 5 weeks, almost 6 and I'm wondering how long I should let him nap during the day?

Also do I wake still wake him up every 3 hours for a feeding? And how long should the feeding be?

Right now he sleeps 1-2 hour naps and so I don't need to wakeup to feed him..he feeds for about 15 mins, plays for 30 mins and feeds again for another 15 then naps.

On a rare occasion he sleeps closer to 2.5-3 hour naps and I do wake him at the 3 hour mark to feed.

And at what week do we allow them to have long nap times and not wake to feed?