I'd also like to add that it's not a race - when you post only determines what number you are, nothing else. And your number won't have any significance on your chances either.
I'm just starting it early for those who're night owls like me, and spans it out over a few days so people have the time to pick a good picture if they want a commission. And in three days time it gives people plenty of time around real life stuff to get around to it. It's a system of fairness and convenience for everyone.
=) So maybe instead of worrying about making your entry ASAP, just remember to post between Wednesday and Friday. If you're a little early, you'll just have to post it again is all. But there's really no point to rushing =) So everyone can relax.