I'll have to assume you mean 30 seconds. This is 0.5 minutes.
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30 minutes
If that's 0.5, half of 30 minutes is 15 minutes.
There are 15,724,800 minutes in 30 years.
270 minutes. 4X60+30=270.
I believe you are asking how many minutes are in 2 hours and 30 minutes. The answer would be 150 minutes. There are 60 minutes in an hour, so in 2 hours there are 120 minutes, then plus 30 gives you 150.