How long can whipped frosting be left out of refrig?

Hi and Congrats on your 1st post, tasytstreats.

Depends on the ingredients or product used....

If perishable ingredients, like whipping cream are used - the frosted cake can be "out" while being served, but no more than 2 hours (per safe food handling recommendations).

If using Rich's Bettercreme, the whipped frosting is shelf stable for 5 days:

http://tinyurl.com/yt4eyu
(Handling instructions for Rich's Bettercreme.)

If using butter or shortening based whipped b/c, the frosted cake wouldn't require refrigeration. (However, left-over frosting could be refrigerated for extended storage.)

HTH

Duplicate post, please also see:

http://www.cakecentral.com/cake-decorating-ftopict-613358-.html

HTH

Thanks what recipe would you recommend it's for a wedding cake in April