Some last for a full season some just half(ie. All-Star break). But some could last just a few weeks. Like there's one that starts in a few weeks called "NCAA Turnament Challange" where you pick the winner of the Road to the Final Four turnament. Each round I suppose(haven't look at it that good because it's still a few weeks away).
But like the ESPY challange and the SuperBowl Over/Under are just one day things. You have several weeks to submit your picks but it's just a one day thing.
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