I also wanted to say that the timing for a 4 hours sprint is pretty bad, anybody on the Asian side it's too late as they have work/school the next day morning and in America they are at work/school. So yea, that was a European contest.
But as I see the comments here, maybe it was a good Idea to do that first sprint when no one is available, probably that codingGame would have been ddos'ed
In any case, I suggest for future sprint like this to start the contest on a Saturday noon UTC. In this way, everybody between middle America to western Australia could participate in a "normal" day without having to skip school, work or sleep.
After that, I'd say it would be way better to leave the game available when the sprint is finished. Just block the submit until Sunday noon UTC for the ranking to complete and then let the marathon start officially. Anyway, anybody that did the sprint could improve its code in a local arena while waiting for the marathon to really start.
I look forward for the marathon and for the next sprint, hoping I could make it.