How do I increase time before the 20 minute lockout in personal vault for onedrive

That isn't much help. SO now instead of unlocking my personal vault on a regular basis, I should post somewhere that I keep on having to unlock my personal vault on a regular basis as well.

Windows provides a screen lock mechanism, why doesn't that get used by Windows to lock / unlock the personal vault as well?

Microsoft is playing games with this one and I have spent the last two hours trying to change it following the help support instructions. I was so frustrated because none of the menu items that the support answer gave were there. In frustration, I did a google search and found this answer: Microsoft will not allow you to change the time????? Why then do they post phony instructions on how to change the time? Their support has taken a nosedive. When you phone the number provided you are directed back to the page that gave you the phone number. No wonder so many people prefer Apple. I also have an Apple mini. When there is a problem they answer the phone quickly and you talk to a human being.

To put large files into your personal vault, just put them somewhere else on OneDrive, the use the web interface to move them into your personal vault.. That is how I got around the 20 min bogus, non-changeable timeout.

I don't advise people to use the personal vault until Microsoft gives you the key to your local personal vault. 

But it's OK to use as long as you have a backup of the data somewhere else.

You may just want to use 2-Step verification on your Microsoft account instead.