Like, do you want them to be restricted on join, or based on time played within the server?
i.e.
PlayerA joins first time on server, and is unable to spawn props, use tools, etc. He must wait at least 5 (300 seconds) minutes before can use any of that..
OR
PlayerB joins the server, and has 10 minutes of playing time, and is unable to spawn props, use tools, etc. He must wait at least 5 (300 seconds) minutes before can use any of that..
OR
PlayerC joins the server, and has 10 minutes of playing time, but is able to spawn props, use tools, etc because he has that 10 minutes of playing time.