Apply a tickler label like tickler/10min, and it will take two executions of the script for the thread to reappear in the inbox: once to convert tickler/10min to an absolute date tickler/@/YYYY-MM-DD at HH:MM, and another to actually restore.

Is this a big problem, is anyone frequently sending things 10 minutes into the future like this? I certainly have never needed to cleanup my inbox on such a short timescale. I guess it could happen if you have a label automatically applied to certain kinds of emails (e.g., tickler/6pm applied to an email coming in at 5:45pm).