0.5 by itself is not a measurement of time. This question has a different answer for each possible unit of time: 0.5 seconds, hours, days, etc. Without that information, it can't be answered.
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If that's 0.5, half of 30 minutes is 15 minutes.
15 minutes are between 2:50 to 3:05
there is 5h and 320min
There are .05 times 60 = 3 minutes
0.5 of 60 mins is 30 mins. 0.05 of 60 mins is 3 mins.