It depends entirely on the antibody they are to be used for.  I'm sure if you look into archives you'll be able to pull up a number of e-mails regarding different antigens and the lability of their epitopes.
 
That aside, its entirely possible to maintain an inventory of pre-cut control slides either at room temperature or frozen.  Again, the archives should be able to give you an idea of which antigens present a problem if control slides are stored at RT.

________________________________

From: histonet-bounces@lists.utsouthwestern.edu on behalf of Amber McKenzie
Sent: Tue 7/29/2008 1:23 PM
To: histonet@lists.utsouthwestern.edu
Subject: [Histonet] cut control slides



How long do you think cut control slides will last?





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