If you'd like to reproduce this NextMuni bug (which only occurs late at night, after the last trains leave), Octoferret's lovely Flickr stream contains details. Obviously it's an error -- what it should say is "No prediction," which is a more useful message than an estimate of when the route starts running again.

We predict that this'll be fixed within a few days. Why? Because NextBus is super-responsive when you tell them about problems. Whenever you spot the system acting weird, just send a note to website - at - nextbus - dot - com. For example, we wrote to them about the 33 acting funny, and NextBus personally replied and fixed the problem within a week. Customer service that's pleasant and professional: Muni must hate them so much.