A month isn't a set number of hours, since its days range from 28 to 31. So you have to find an average month. An average year is 365.25 days long (since we have leap years every four years), so an average month is 365.25 / 12 which is 30.4375 days. Since a day has 24 hours, an average month is 730.5 hours, so 90 months is 65,745 hours.
This is only for an average month though, so it really depends on which months you're counting!
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90 days is 2,160 hours @24 hours per day.
about 3 month
Depends on which 3 months you mean, some months have 30 days and some have 31, February has 28. So about 90.
90 x 12 = 1080 months
To convert minutes to hours, you divide the number of minutes by 60. Therefore, 5400 minutes divided by 60 equals 90 hours. So, 5400 minutes is equivalent to 90 hours.