Trigger using time range

I have a task that I need to run every 15 minutes for a 6 hour period every day. How can that trigger be set up? I don't see a provision for this in the Schedule object.

Sorry, Automate Enterprise 11.

I have answered my own question here. Schedule object fires the task daily. Put the task in a loop with a wait for duration of 15 minutes at the top. Do the math for how long it needs to run. 6 hours means I need it to repeat the loop 24 times with a 15 minute wait.