Conversation so far:
What was Vaslav Nijinsky biography?
Vaslav Nijinsky was born in 1889 or 1890 in Kiev, Russian Empire, as Wacław Niżyński, to ethnic Polish parents
Who were Vaslav Nijinsky parents?
touring dancers Tomasz Niżyński and Eleonora Bereda
How did Vaslav Nijinsky get interested in ballet?
Vaslav Nijinsky was introduced to dance by his parents

Question: How long did he perform with them?
Self-contained rewrite: How long did Vaslav Nijinsky perform with his parents?