20 minutes.
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0.75 of an hour is 3/4 of an hour or 45 minutes.
There are 20 minutes in a 1/3 of an hour
1 hour = 60 minutes 3/4 hour = 3/4 x 60 minutes = 45 minutes
There are 45 minutes in 3/4 of an hour because 3/4 times 60 minutes = 45.
If you mean 2/3 of an hour then there are 40 minutes