Can't vouch for Montana, but around here the lowest level of the judiciary works 24 hours. They take turns having the duty and there's typically only ONE judge on duty at night, but it's possible to have charges accepted by the court at any hour.

However the "information" in Montana and federally is actually the statement of charges by the prosecutor. It doesn't even need a judge to be "filed," just transmitted to the court somehow.

What makes you think that the legal process is obligated to work during business hours? There's no constitutional or other precedent that would imply this.