60 seconds in one minute and 60 minutes in one hour means that 1 hour = $60 * 60$. Calculate that out and you’ll find that 1 hour = 3,600 minutes.
Three days is 72 hours ($24 hours * 3 days$), equivalent to 4,320 minutes ($72 hours * 60 minutes$), or 259,200 seconds ($4,320 minutes * 60 seconds$).
730.08 hours is equal to 43,804.8 minutes (730.08 hours * 60 minutes), or 2,628,288 seconds (43,804.8 minutes * 60 seconds).
If a specific month won’t work and you just want an overall sense of the number of days in a month, for example, you know that there are 365 days and 12 months in a year.