Haha hours. There is no upper bound. The average Amtrak delay on Norfolk Southern is 19 minutes per 100 miles. And the worst cases are all horror stories. A freight operator sidetracks Amtrak while a miles-long coal train rolls through at a jogging pace. The coal train breaks down. The Amtrak crew can't legally operate any more because of federal time limits. You are 1000 miles from a city in the middle of nowhere and by the time they dispatch another crew to your train you've been surviving on Fritos for days.