Conversation so far:
How did Buffalo Springstein form?
Neil Young and Stephen Stills met in 1965, at the Fourth Dimension in Thunder Bay, Ontario.
How did Richard Furay get involved?
Stills invited fellow Au Go Go Singers alumnus Richie Furay.
What was Richie invited to?
Richie Furay and former Squires bass player Ken Koblun to come join him in California.
What did they do in California?
A few days later, they began a short tour of California.

Question: How long did they do the California tour?
Self-contained rewrite: How long did Richard Furay and Ken Koblun do the California tour?