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Under the federal rules, an inmate must serve at least 80% of their time to be eligible for parole, with the credit for the 54 days, this means his earliest parole date should be 239 days from the first date of his sentence. So, you have to calculate the date from the first date of his sentence. Parole is discretionary to the parole board, but that is the first available time it could be considered.
Based on what you are saying though, this situation sounds like he should be filing a motion for post conviction relief based on the judge changing the terms of the agreement he made with the US Attorney and also based on his mental health condition which makes his allocution in his plea void and you should be helping him to pursue a release and getting the sentence vacated on these grounds.
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