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chromedriver uses 300,000 ms (5 minutes): https://code.google.com/p/chromium/codesearch#chromium/src/chrome/test/chromedriver/session.cc&type=cs&l=31&rcl=1423688364 FirefoxDriver uses -1, which for it means “infinite”: https://github.com/SeleniumHQ/selenium/blob/master/javascript/firefox-driver/js/wdsession.js#L116
Landed in https://github.com/w3c/webdriver/commit/f05cbd4f94c05d17d1adef698dff319972bcbcee