I'd be able to write 90 pages. I write a lot of crap but it's fine as long as I don't go off course completely.
90 pages does sound ridiculous though.
If I want to go into pharmacology, I could definitely write 90 pages because it has to do with biology, chemistry and mathematical wording. I was so good at math that I skipped a year. But now I suck at even getting out of bed.
Going out for cigar before it goes completely dark. I like the evening.
Take care. Hope everyone gets a better or good sleep.