I wanted to add discounts to my items for 24 hours, however this didn't register. I double checked, clicked the appropriate box, tried it again with the different items, got the same results across the board.

When I went in again and selected 4 hours, this did work. (8 hours worked, too). From that point, I went in again and changed the 4 hours to 24, and bingo, it's there now.

It's no biggie as I've found a way around, however would be nice to be able to do this on the first try.