I have never had a problem storing them for a couple of weeks assuming cool, dark and dry storage. Sometimes longer as long as they aren't beginning to shrivel.

Dave

I had to leave some for 5 weeks last year, (long story) and did as digdirt said - left them cool and dark, and all was well.

BTW, if you're planting spuds already, you should know that in my heart, I hate you - I'm still shovelling snow :-(

You don't want to plant potatoes immediately after cutting. The rot too easily if you don't let the cut end dry. My husband cuts ours up and puts them in the garden shed for about a week. It is dark and dry in there. After that he plants them and we never have a problem with them sprouting after they are planted.

I don't see a problem leaving them for longer