Oh my god, like a few hours will change anything after 10 days of contest ?
If the contest ends during the night/morning in my area, someone might push something and steal my rank at the last minute
If someone sniped you and wants to surprise you, he will push in the last 1 or 2 hours. I don't think that you can analyze/counter an AI in a such short notice anyway.
Also, I've done 13 multiplayers contests, and never have I wrote some useful code in the last 24 hours of a contest. And I'm pretty confident it's the case for most of the top contestants.
The only thing that matters to me is that I have between 1 and 3 hours of free-time after the end of the contest to watch the full rerun, if possible.