Every case is different.
That said, been there, done that. On the road from home in Virginia to professional conference in Las Vegas to start annual vacation when the oil supply line to the turbo blew out in Russell, Kansas. Discovered the problem when I stopped for lunch in a rest stop, and seeing the front of the TT coated in black diesel oil, I investigate. Of course, this was lunch time on Saturday.
Fortunately I had just purchased the oil for a planned oil change, so I had enough oil on hand to fill up the crankcase. It hadn't dropped enough yet to set off the oil light, but it did take half the oil-change volume. Managed to limp the 2 miles to the nearest campground for the weekend, and it took the rest of the oil-change oil to refill when I got there. Monday morning, I got the truck towed to a dealer in the next town over, and they tracked down the only replacement part west of the Mississippi, and got me back on the road by Wednesday afternoon. (herewith a shout out to the Lewis Chrysler/Jeep/Dodge/RAM/Toyota folks in Hays, Kansas. Thanks, guys, you did good.)
And yes, had the truck died completely, I'd have been buying a new truck from that dealer to continue the trip. But a new oil line is a lot cheaper.
