I don't think the tasks are terribly small here, but they could be ramped up a bit by sprinkling in some of other topics on top of the main focus; ex: gen chem (majority of day, e.g. a chapter, 3-5 Chad videos, etc), bio (20-40 questions in destroyer), pat (a single test). And another thing, reviews on topics already completely covered need reviewing throughout, which could act as those sprinkles. 88 days does seem like a good amount of time though, so I can't argue with that.
But, I could never do something like destroyer in 3 days.
I keep reading about people studying 8-10 hours a day, but that sounds crazy to me. Maybe doing that works for some people, but I often think its done because people are simply setting themselves up with a minimum amount of time (e.g. 6-8 weeks). Another factor to consider is how recent the relevant science courses were taken, you can't expect someone who took chemistry a few years prior to just whoosh through it all in a few days.