Can someone please confirm the following is correct?

If you wish to say once a week you can say "haftada bir". Would "haftada iki" mean twice a week?

"iki gun haftada" means two days a week? If so is there a reason for "haftada" being in a different place in the sentence?

"ne kadar zamandir turkce ogreniyosun?  How long have you been learning turkish?

Two days a week = Haftada iki gün.

That´s better translate for daily usage.

thank you for a quick response Harpoon.

can you help me with the last sentence as well please?

Last sentence seems enough good so may be it is the reason why harp00n didnt tell anythng about it

thanks Ahmet