30 day boxes does not work

[BHurt]

I log into my emails, username password, 6 digit code.

Tick the box so it accepts my 6 digit code for next 30 days.

log in next day say process and ask again for another 6 digit the 30 days does not seem to work.

I have had the same issue 4 times in last 7 days.

[Mark39]

@BHurt when you've finished with email don't log out. Just close your browser. It will then remember you.