Rehumidifying old cigars

[TomF]

I have a very nice handmade oak humidor which I bought about 20 years ago and haven't opened in a very long time and which still contains what I remember to be some very, very nice smokes. Recently my son returned from a trip to South America and brought home a few very nice cigars which he thought I might like. In thinking about how to keep these new ones properly stored I decided to try to raise my old cigars from the dead. I have obtained a Xikar Crystal humidifier box for the humidor which I have charged and put into the humidor.

I am wondering how long it might take until the old cigars, which have not seen the light of day in at least a decade, rehumidify, and is it even possible to bring them back?

Thanks in advance.