Not sure if it's been posted before but I've been doing it wish the winter stuff> say you have a stack of snowballs that only have 6 hours left. If you get a new set of 5 with the 10 day timer take one of them out and put 19 of the other stack with the 6 hours timer and it will reset them to 10 days or what ever time the item has. I've done it with all the items and seems to work so far for me.