The Netherlands have been in the semi-finals twice, once in 1974, and the other time in 1978.
In the semifinals there is 7 rounds, but which ever team wins 4 rounds first is who can move on.
4 times
they have entered 23 times
3, twice they won it 34 and 50
They entered the Olympics with 57 times.
three times
57 times
Lots
Yes, The Netherlands have won Eurovision 4 times.
4
12
4