Quick run schedule - in X minutes/hours

I sometimes set ad hoc runs of my schedules, as needed depending on grass condition. But I would also like to set it up in X hours so I don’t have to remember to come back on the app to trigger it. Especially if I notice that the grass needs water, but if its 1 pm i don’t want to run it right away. It would be great to be able to set a “quick run” in 6 hours or so.