Difference b/w cookoff, lunchtime, and challenge

Is there any difference b/w these three competetions(on basis of level), or they are all same(just name different)

Cook off-It basically a short contest of about two and a half hours.There you have to think fast and there is time pressure on you.

Lunchtime-It focuses on school children but you can participate if you like. It’s a 3 hrs contest.

Long challenge-It is a 10 days long contest which occurs every month.

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Also, Lunchtime is unrated.

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