You can add permissions to people for a certain time using:

pex user timed add

However, if they relog or server restarts, they lose the permissions. Can you fix this please

This is how timed permissions work in pex 1.x, which is no longer supported. Timed permissions in PEX 2 will have the option to be saved or transient, just like regular permissions.

So how do I create the option to be saved?