Is there standard way to calculate the total hours in a month?

Yes, the total number of hours in a month will be determined by the number of days that month has. Multiply 24 by the number of days, as there are 24 hours in each day. Indicatively, a 30-day month contains 720 hours and a 31-day month contains 744 hours. In calculating long-term, the average hours spent by many businesses are about 730 hours per month.