All 3g (aggravated) cases must serve 1/2 of their flat sentence before becoming eligible for parole so this person will not be eligible until he has served 5 flat years. (Eligible does not mean he will necessarily get parole.)
Ms. Henley is absolutely right about the minimum time that must be served and also about eligibility for parole not being the same as getting paroled.
Fact is, the parole board has ways within the law to keep anyone from being released until the entire sentence has been served.
To maximize the chance of parole at the first possible time, the prisoner might want to consult a lawyer who specializes in advocacy before the parole board for prisoners coming up for parole.
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At a minimum, a 3g aggravated felony must complete half of the term assessed, in this case 5 years. My experience is that it is usually 75-80% of the time assessed before being released on Parole, if then.