How do you know if we spent 5 minutes on it?
One can only assume that an MS paint drawing took more than 5 minutes because it may look too good or too detailed, despite whether the artist was honest or not, thats the only hard thing about this competition, different perspectives and honesty.
No one can truly know if they really did that in 5 minutes, they can only assume through their own perspective.
however I am assuming that it isnt up to kamietsu to determine that, since the community is actually deciding the winner through voting.