Version 2018.02 adds to ability to define tasks that repeat after a specified number of hours. In the previous version, the interval for repeating tasks was limited to days, weeks, or months.
To define an hourly repeating task, check the "Repeat every" box, select "hours" from the drop-down, and enter the number of hours until the next instance of task. The next instance will be automatically created when the current instance is completed.