Hi, I need help with pex, Is there a way to set up ranks so that when the user has played on the server for a particular amount of time then they get the reward for example when someone plays for 12Hours they get a rank then if the play for 24 hours then they get a new rank??, If So how can I do it

What you're looking for is called AutoRank.

Instructions for setting it up can be found on the above page.

Good luck and have fun!

You're welcome. :) Have fun!

Thank You

also I am using Permsex to do the ranking stuff so will I use the group name or the prefix for the group and will I edit simple config or advanced config I edited simple config and put in the rank prefix did I do it correctly or wrong

After you have read all of the documentation for AutoRank, you can decide what config to use and how you want people to be able to promote themselves. It is a fairly complex plugin, capable of offering a very large variety of ways people can rank up, so be sure to read everything on the page above, and the links on the right side to the permissions and commands.

The prefix/suffix being displayed in-game is handled by a chat management plugin, not PermissionsEx or AutoRank. Since most people are running Spigot servers, and using EssentialsX for the basic commands, they also use EssentialsXChat (+ Vault) to get prefixes displayed in-game.