I have a product that sells fairly slowly, but its advertising consistently sells out quickly.

Usually it’s out of budget by 10am.

I think it might be that the audience who are more willing to buy the item will be up later in the day than this, but it doesn’t seem worth me tripling the budget just to reach them.

Is it possible to set a time of when to refund it, rather than blowing it all in the morning?
I can think of a hacky way of giving it a zero spend budget and then increasing it when I want the advert on, but I was hoping for something automated