Feeding on demand vs routine

[meow]

I've never been into the idea of feeding my bubba on a routine set by me as I figure he knows when he's hungry better than I do. It's working fine for us but I've been pondering how routines work lately...

My MIL kept telling me "It gets easier at 6 weeks as you can sleep through because that's when they drop the 2am feed and go from 10pm to 6am". She's realised now she's seen us parent that we demand feed and doesn't say this anymore but as we approach the 6 week mark it has me curious... could my little boy actually go 8 hours between feeds??

He currently wakes to feed every 3-4 hours so I can't imagine it but obviously it's possible as my MIL raised 5 healthy children this way. How would it happen naturally? Would we just wake up after say 6-8 hours one day and realise he'd skipped a feed?