So far, I've used the Wilton all-crisco recipe partly because it has a long shelf life at room temperature. If I switch and try the buttercream dream with real butter, how long will it keep at room temperature (such as on a cake) or in the fridge if I make it ahead of time.
Thanks!
about a day out of fridge. 5 days in fridge, 6 months in freezer 
Q. Why is salt a good food preservative?
A. Salt is considered antibacterial because it restricts bacterial growth in many foods. It preserves foods by lowering the amount of "free" water molecules in foods. Bacteria need moisture in order to thrive, so without enough "free" water, they cannot grow well in foods that contain salt.
Source: Excerpted from FDA/CFSAN Food Safety A to Z Reference Guide, September 2001
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