sorry, maths wrong- it was 60 hours (2.5 days- obviously not a maths thesis...).
sure, but i was 22 at the time, had a deadline to meet, experiments to finish, too many illustrations/diagrams, etc. to caption, and chapter/section headings to compile into Contents and index. plus get all of the references in order.
now I have a 19 year old bloke in my team who can go 48 hours no problem when he is out clubbing. i am pretty sure that's drug free
and he does not drink, so...