This technique works in any processor, but of course the details of syntax and implementation vary.
Set up a timer for a one minute (60 second) pre-set with the required enabling logic. The output of the timer trips a counter, which then counts up every minute. Use the output of the timer to reset itself. This makes the timer zero out and begin timing another minute.
Set the counter pre-set to the number of minutes (hours x 60) requried. When the counter hits the preset time in minutes it will enable its output, and you are good to go.