I've met truck drivers in the US that were driving 16 hours per day. I'm not sure if it is legal or not but it certainly wasn't considered exceptional. It's insane the kind of pressure some jobs put you under. Now ATC has obviously more potential for misery than a truck driver, still a passenger bus / truck collision isn't a small thing either.
Truck drivers and the hours they're on the road need to be logged per law. Most of this is done (or perhaps MUST be done) electronically.
16 hours is generally not allowed unless there are severe adverse conditions, but it's only recently with ELD (Electronic Logging Device) mandates that these rules are being forced to a degree. Before that, many drivers would simply go as many hours as they humanly could to keep moving.
See: https://www.fmcsa.dot.gov/regulations/hours-service/summary-...