http://3m3htihjafazx3etsscphvyskhmhbsv7cf2cgc4unvna34xshluptgid.onion/faq.php
Only 3 confirmations for any Bitcoin amount are needed. If you accidentally close the browser's window, what are your next steps? After receiving the deposit address, you don't need to keep the window open, because the mixing process will be done automatically.