Your Tor session should change exit nodes at least once every 10 minutes.[1] Ignoring everything else (e.g. pressing the new session button on TBB, restarting t

Your Tor session should change exit nodes at least once every 10 minutes.[1] Ignoring everything else (e.g. pressing the new session button on TBB, restarting the browser, failed connections etc.), this gives us p(using a bad node)=1-(.973)^(t/10) where t is how many minutes you've been using Tor. So if you've actively used Tor for more than 4 1/2 hours over the past month, it's more likely than not that you've used one of these nodes. [1] https://www.torproject.org/docs/faq.html.en#ChangePaths https://www.torproject.org/docs/faq.html.en#ChangePaths