Conversation so far:
What was the Eurovision song contest?
An annual international song competition, with participants representing primarily European countries.
Did ABBA win the Eurovision song contest?
ABBA won the Eurovision Song Contest 1974 at The Dome in Brighton, UK, giving Sweden its first triumph in the contest.
What was the song ABBA contributed during the eurovision song contest of 1974?
Waterloo
How did the crowd react to Waterloo during the eurovison song contest of 1974?
The band saw the Waterloo single chart in many European countries.
What did ABBA do after winning the eurovision song contest of 1974?
In November 1974, ABBA embarked on their first European tour, playing dates in Denmark, West Germany and Austria.

Question: How long did the tour last?
Self-contained rewrite: How long did ABBA's first european tour last?