7-Day Same Time Streak
Do one small task at the same p.m. time every day, like reading at 8 p.m. Check in once a day.
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Science · Facts & stats · iChallenge network
Daily facts and stats about p.m., clocks and how we tell time, plus real challenges to put them to work.
How many degrees does the Earth rotate in one hour?
The Earth turns 360 degrees in 24 hours, which is 15 degrees per hour.

One ranked attempt per day. Practice as much as you like.
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Do one small task at the same p.m. time every day, like reading at 8 p.m. Check in once a day.
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Build a simple sundial with paper and a pencil, mark the hours on a sunny day, and post a photo link or write-up.
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Each day, write the times of three events in both 12-hour and 24-hour format. Check in daily.
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Pick three cities in different time zones and post a short write-up of what time it is in each at 6 p.m. where you live.
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Live counts from PMChallenge.com. All arena stats →
Earned on any arena, shown on your profile everywhere.
Add your email to keep your level, streak and badges if you switch devices, and carry them to every iChallenge arena. One email when you save; no spam.
Fund a prize on PMChallenge.com and your brand sits on the challenge card, the leaderboard and every finisher's share. Prizes only appear once they're funded, so players can trust what they see.
Play today's quiz round, post your score, and start a streak.
XP, levels, streaks and badges. Save your progress with an email and it follows you to every arena on the iChallenge network.
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
100 points per correct answer, up to 50 more for answering quickly, a combo multiplier for answers in a row, and 150 bonus points for a perfect round.
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.