How much jail time will you get for a first time violation of probation

How serious was the violation, if you robbed a bank and that was your violation, it is a lot different than being out past curfew.

But the max time is your entire probation time back in jail

The probation is for a poss. Of marijuana for 18 months.

You need to re-read your original sentencing paperwork or Final Disposition and see what the Judge had on his mind the day he sentenced you. You could use that as a good guesstimate of just how much time you are looking at (in his eyes) for any VOP. You will find out at your VOP hearing.