Homekit automation rules

I had already read the apple documentation and found it to not be helpful on what should be a simple, straightforward task.

However, I think I finally figured it out by playing with the rules on my Mac instead of on iOS. The answer appears to be that you need to create a whole separate rule to turn off things at a specific time.

This is excrutiatingly un-intuitive for Apple for two reasons: the pick list that allows you to turn something off up to 60 minutes later in the 'turn on' rule misleads you into thinking that is the only place to do it, and second, the action to turn something off is obscure at best.