Hi Graham Kelly - unfortunately your solution is not feasible in a school. Teachers take the time later on the back end to check times of students coming and going through the excel spreadsheet - which is accessible, and I do use the form (and attached excel spreadsheet) as a record of students leaving and then another form for students returning. But our hallways have designated color (physical) passes (so someone can quickly see if a student is "out of zone"), and my students use their phones (with a QR code) as their accountability for if they're stopped and asked who gave them permission to be out of a classroom. But if an administrator or teacher stops the student and asks to see their pass, the most the student is accountable for in that moment is a receipt that says the day, date, and room from which they left -- not a time. An administrator or teacher would have to follow the student back to my room to check the excel sheet, or pull up their own account, forgoing any other 1000s of responsibilities (like watching for other people and students in the halls) for which they'd needed, to look it up.
It is wholly inconceivable in the fast-paced setting of a high school to stop everything and pull up an excel spreadsheet in a hallway. A better solution - a solution for which many, many teachers have asked for this feature in many forums -- would be for Microsoft to add a time stamp option.
Thanks for considering the problem and offering a solution -- but it wouldn't work realistically, given the time and efficiency restraints.