If they pleaded guilty, they would have done so with an understanding of the penalties the DA’s office was seeking, whether that is a fine, jail, loss of license, etc. They would plead guilty with an agreement to those penalties, or they would plead “open” and let the judge decide (who will often take the DA’s advisement). If there’s jail time involved, they would agree to go into custody after pleading, or the Court would order a reasonable stay (delay in reporting to jail) to let the convicted get their affairs in order before disappearing for a week or however long. They may have been given a payment plan for any associated fines; if they don’t stick to the arrangement, your friend could wind up back in court on a failure to pay warrant.

There is also a separate, administrative State process through the BMV that will determine for how long your friend loses his license. This will usually match up with any license suspension ordered by the Court. As someone stated above, the criminal speeding is an aggravating factor in the OUI, so it could be longer than the statutory minimum suspension.