I agree with two things said here (well two in particular - I haven't read anything I don't agree with really ) - don't worry about the clock, and go by your baby's cues.

I've got the opposite with mine, he's feeding approximately 4 - 5 hours apart! (Sometimes shorter, sometimes longer.) Which I at times worry about, til I realise that if he's hungry, he knows how to get my attention :P

If you want to stretch between feeds, how about stretching for just a few minutes more each time? Like stretch for 5 or 10 mins more til they're used to that and then add another 5-10 mins.

All the best with whatever you do.