The cost to request your NIF includes one year (12 months) of fiscal representation. At the end of that year, your fiscal representation will automatically be renewed at a rate of €99/year. You may cancel this service after you become a Portugal tax resident and update your address with the tax office.
We can not guarantee the timing that depends on Portuguese authorities, but we guarantee the refund of the urgency fee if you don't get your NIF during the expected time frame.