The internationally-recognised time to start any homework
that has been assigned for one's weekend
. This includes (but is not limited to) math problems, lines, essays, papers, presentations, studying for exams, and take-home tests.
Larger projects are usually assigned over a weekend because of the "extra time" it gives students. This is amusing because students do not utilise this extra time, instead choosing to begin work on at the very end of the weekend.
In some cases, Sunday afternoon
is better stated as Sunday evening
See also the eleventh hour
Geez, I hate my teacher. Can you believe she assigned us a 10 page paper on Friday? She knows no one's going to start until Sunday afternoon!