How long or for how long???

[wally2]

I am wondering which is the right way

ex How long have you been living in Canada?

or For how long have you been living in Canada?

Thks

[jirikoo]

I am wondering which is the right way

ex How long have you been living in Canada?

or For how long have you been living in Canada?

Thks

the latter is a lot more used.
or else: How long have you been living in Canada for?

[Anglika]

I am wondering which is the right way

ex How long have you been living in Canada?

or For how long have you been living in Canada?

Thks

Both are correct. The second is more formal, the first is more colloquial.