how do the judge prove the program was made in 2 hours? o.o I know you could for example make the contest at 10 AM GMT-5, but imagine if the contest manager got called for work 30 mins earlier, or had to suddently go right at the time he posted the notice, or had to go 2 hours later? It should be considered. Maybe one day/12 hours would be ok?

It's not a bad idea tho, but I think it should be done a weekend, so almost everyone is free.