I practice in a different Commonwealth (PA), so we'll both have to defer to responses from learned MA counsel on this question. In my experience Judges are willing to exercise some discretion in this area when presented with a pretty strong reason for deferring commencement of the sentence. The willingness, though is normally appears only with sentences to the local/county jail (sentences under 2 years) A sentence of 3 years would be a state sentence here to be served in a state correctional institution and would less likely find a judge being flexible. Usual procedure for a defendant in such a situation is to be taken into custody by the Sheriff housed in the County until the next bus to our state system's classification center. What has your attorney told you?
You make no sense.
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DO you have an attorney? If so set up a conference asap. If not, consider finding one. Anything is possible, but on these facts alone it is tough to tell. More details welcome.