There are 90 minutes in 1 1/2 hours. However it depends on wether you are talking about Earth hours or a different planets hours like mars, which would technically go faster, and hours would be shorter...
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There are thirty minutes in one half hour.
1 hour = 60 minutes → 4½ hours = 4.5 × 60 minutes = 270 minutes
theres 30 minutes in a half hour.. theres 90 minutes in an hour and a half.
one 1 hour = 60 minutes 1/2 hour = 60 x 1/2 = 60/2 = 30 minutes