One of the goals for level 38 in Alto’s Adventure is to survive a full day.
How long is a full day in real time?
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Sign up to join this communityApproximately 7 minutes 20 seconds. I watched this video of a walkthrough of the level and the start of the run was about 4:50 and they got the challenge completed at 12:10. Also this video the run started at 0:20 and got the challenge at 7:40
I'm not sure how long it is in real time, but I found it useful to pause the game every once in a while to check on my progress. The pause screen will tell you how close you are to each goal. After one full day, for example, it would say 50% for your goal.