How long does it take to get a Portuguese student visa?

Hi!

I'am planning to apply for a Portuguese student visa at the Embassy of Portugal in Abuja (Nigeria). I'am in Cameroon. How long does it take for the visa to be issued? Is there any interview to pass?

Answers from anyone with relevant information regarding Portugal student visa (preferably taken from Portugal embassy in Abuja or in other African countries) is welcome.

Thanks in advance.

Jefh