How long can your PO put you away for your 3rd VOP?

The PO does not "put you away". The PO reports your violation to the court and the judge decides. You have not told me what you are on probation for nor have you said the nature of your prior violations; nor have you said over what period of time those violations were. With three violations, I suspect the judge will order substantial jail time since probation does not seem to be working.

The PO doesn't put you away; the judge does. The PO can arrest for a violation, and then the probationer is taken to court where the judge decides what punishment should be imposed. If this is a parole situation it is a little different, but I read this as pertaining to probation. If the original sentence was suspended, the judge can decide to give the person up to the maximum for the charge(s) on which the person was granted probation, applying the appropriate time credits for any time already served. If a term was "stayed" it is that term which the judge must impose when finding a violation.

Depends on what your on probation for, or how much time remains on your suspended sentence. Either way, not a good situation.