Conversation so far:
When was the never ending tour?
The Never Ending Tour commenced on June 7, 1988.
How long did it last?
Dylan has played roughly 100 dates a year for the entirety of the 1990s and 2000s.
What songs did he sing on this tour?
There's no logical answer to that, so we sent them the set lists from the previous 3 months.
Did anyone join him on the tour?
CANNOTANSWER.

Question: How long did they join him for?
Self-contained rewrite: How long did anyone join Bob Dylan for on the Never Ending Tour?