ANSWER:

The prayers are valid. 

Long qunoot is not part of the sunnah, however it doesn’t affect the prayer. 

we have several mosques in the naborhood but the one which follow Sunnah is one, but i am confused these last 10 days Qiam Al layel he stays on Qunut more than 15min. Is our prayer accepted as u said long Qunut is not part of Sunnah?

Taraweeh, Tahajjud and Qiyam-ul-Layl |