An Important Lesson
Function for how long it takes your supervisor to return your document with comments:
t = (p x c) / (wd - sd)
where
t = time (days) until your document is returned
p = pages of document
wd = non-holiday weekdays this month
c = # of cats your supervisor owns
sd = # of sunny days in the last 20 days
If this isn't a PhD comic, it should be.