Help with adding a new meter to my character

[PROfessor13]

I'm trying to create a character that can't spend x amount of seconds in the cave while insane. The timer pauses when the character is no longer insane, but only resets when they leave the cave. I've tried using "local cavetime = 240" and that doesn't work. I'm currently working on a new meter called "cavetime" that whenever I try to change it through DoDelta or SetRegen functions it won't work and kicks me instantly from the server. Any way this could be fixed? Or is there a better approach to this?