Now that I have the attention of the Vegas crew

I just acquired a 455 crank from QuickOlds (thank you very much). I was always told to store a crankshaft standing up on one end. Does it really hurt them to lay them down horizontally? Even if it was just for a few days/weeks? In my garage I think it might be safer that way, as my grommets don't ever watch what they are doing. They are the original "bulls in a china shop". All input is greatly appreciated.