I visited my friend's farm house for few days.
or
I visited my friend's farm house for a few days.
Please advise me about correct form.
With Regards!
I wouldn't say that 'I visited my friend's farm house for a few days.' I'd rather go for I stayed at my friend's farm house for a few days. (not just few days), or I spent a few days at my friend's farm house.
Note that I am not a teacher.