With all of the incredible post-game content that SOTF added, the game now is easily 12 hours. I have found that sitting down and playing the game for that long with my allotted 15 minute breaks is significantly harder than actually finishing the game quickly.

I think allowing segmented runs of the same save file is one of the only way to have real movement in the 100% Super neo goated ultra 100% or whatever it's called. What do you think?

I'd say no to this, since there's a lot of %100 categories of games that also don't allow segmented speedruns. If anything. Maybe allowing more or longer breaks would be a better call.