1 hr 59 mins is 20 mins or 1/3 hour bigger than 1 hr 39 mins.
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59 minutes
299 minutes divided by 60 (minutes in a hour) = 4 hours 59 minutes
It is: 1 hour and 59 minutes
If you mean 29, 39, 59 and 79 then it is 39 that is the only composite number.
About 1 hour. (It's actually 59 minutes.)