He will be required by the court to serve up to the entire sentence that was imposed upon him originally minus credit for any time he actually served in jail prior, so yes, up to 8 years he can be sentenced to on the probation violation.
He gets no credit for the time he has been out on probation/parole towards the time he has to serve on the probation violation.
Having an attorney can help in that the court has discretion in how long they sentence him up to the 8 years, so the attorney can negotiate for a lesser sentence in jail.
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