[Python-Dev] Git hub : CLA Not Signed label

All, I submitted two Pull Requests last Sunday, only a few hours after I signed the CLA. I understand why the 'Knights who say ni' marked the Pull request as 'CLA Not Signed' Label at the time I submitted the Pull requests, but I was wondering when the Labels get reset. How often (if at all) does the bot look at old pull requests ? Thanks for any help you can give, I am sorry if the question sounds basic.