I think it takes about a day.
I've been waiting 2 days and can't bet anyone in administration to explain why
My ad has been processing for a week totally locked up. CarGurus sucks. Try craigslist or Cars.com.
FYI, I changed some details on my listing and was asked in an email to send in a photo of my car with a special CarGurus 'code word' posted in the windshield. My listing immediately went back into 'processing' status in the meantime.
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