It's easier to simply increase the amount of days before rep decays.
Open this file
Code:
Karryn's Prison v.9B EN\www\js\plugins\RemtairyPrison.js
Ctrl + F (find) the following
Code:
this._daysWithoutDoingWaitressBar >= WAITRESS_REP_DECAY_DAYS
should be around line 1421
Replace WAITRESS_REP_DECAY_DAYS with whatever number of days you like
Code:
this._daysWithoutDoingWaitressBar >= 1000
Same can be done for other jobs, it's the same kind of code for all of them - it's located below the waitress decay code.