My snail mail goes into a post office box and I only go check my post office box for mail every 4 days or so and sometimes I don't get to the mailbox until a week or even 2 weeks later.
If I'm expecting a package then I'll go get the mail and package on the day it arrives at the post office or I'll check it more often to see if the package shows up.
But other than that I don't have any other important mail that comes to my mailbox that needs my immediate attention.
So I just leave the mail in the mailbox for a week or longer and it's never been a problem.
I do check the mail after a few weeks though to make sure my mailbox isn't too full to allow room for other mail otherwise the postal employees will remove the mail and hold it and then send it back if you do not come back and pickup the mail.