There are between 672 and 744 hours in a month, depending on the number of days in that month. For a month with 28 days (February in a common year), there are 672 hours; for 29 days (February in a leap year), 696 hours; for 30 days, 720 hours; and for 31 days, 744 hours. On average, considering all months over a year, there are about 730 hours in a month. This average accounts for the 365 or 366 days in a year divided by 12 months, multiplied by 24 hours per day.