Complex Timed event with automation?

Smartthings has much deeper automation possibilities than IFTTT, but right now most of those are only available through the classic app. So the first question is which smartthings app are you using? ( you can use both at the same time, and many people do, particularly if they have Samsung appliances or televisions which only work with the new app. )

Anyway, take a look at the complex logic FAQ (the thread title is a clickable link) and it will lay out some of your options: