I would presume 30-60 days. That 1/h I saw posted didn't say how big the claim was, and everything previously has always been X upkeep/hr * size of claim (X can be less than 1).
Opinions expressed in this statement are the authors alone and in no way reflect on the game development values of the actual developers.
Thank you all for replying, this will help many people in the future. There's people going around dropping bonds thinking the claim they had will disappear in a day or so.