27 minutes but well worth the time if you are considering a safe or upgrading one, as I just did.
https://www.youtube.com/watch?v=ltK-bDbADa8 While this video is about gun safes the concepts are the same and the info I got from here allowed me to make a very informed purchase. Not sure there is better info out there than what is provided here.
https://www.youtube.com/watch?v=ltK-bDbADa8