[said]

"Many prisoners released early may not wind up being re-incarcerated, according to Brown. The law requires the state to give day-for-day credit in most cases to a prisoner who has been released early and hasn’t been found to break any laws since, he said."

It's unclear whether "breaking the law" includes speeding.

It's also unclear whether (former) prisoners must avoid breaking the law until their proper release date, or whether they must avoid breaking the law until the state discovers its mistake.

If it's the latter, it would be in the interest of an incorrectly released prisoner to inform the state of its mistake the morning after their proper release date. Of course, in this particular situation, the prisoners likely had no idea they were incorrectly released.

[pc86]

If you were released the average of 55 days early, my guess is that you are not re-incarcerated unless you commit another crime sufficient that you would be returned to prison. At that time the first 55 days of your sentence would be for the first crime, not the new one.

Just an assumption, IANAL.