Conversation so far:
Did Hasan al-Askari ever marry?
Hasan Al-Askari married Narjis Khatun.
Who was Narjis Khatun?
Narjis Khatun was Hasan al-Askari's wife.
Did Hasan al-Askari and Narjis Khatun have any children?
According to many, Hasan al-Askari's only son was Mohammed. Some sources enumerate up to three girls and three boys. Some others say he did not have any offspring.

Question: How long were they married?
Self-contained rewrite: How long were Hasan al-Askari and Narjis Khatun married?