Board Thread:General Discussion/@comment-174.57.160.33-20130404045432/@comment-5469467-20130404050302

I assume you mean the ones in Skyrim, and I read on WikiAnswers that it's 48 hours out of the chest's vicinity (i.e. while you're not in the Ragged Flagon Cistern). I didn't really use them that much, so I'm not sure if this is true.