Quote: Mr Carl "I can manage to sit at my desk at work for two and a half hours without starving to death or pi$$ing my pants! It's not the far side of the moon.'"
In fairness, sitting at your desk is not the same as driving a car/bus and doesn't carry any of the attendant risks if you nod off or get distracted. Advice for driving long distances is to stop for 20 mins at least once every 2 hours.