Question

چند وقته که مادرتو ندیدی

Answer 1

hi

When did you last see your mother?

How long is it since you saw your mother? (This, of course, is when we are thinking about the period rather than the date)

http://goo.gl/YxwGIP

 How long has it been since you last saw your mother? (this asks about the duration only)

http://forum.wordreference.com/showthread.php?t=48753

Comments

Excellent explanation! 

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Thanks dear keramus