Well Normally it takes around 3-4 weeks to register a Company in India, but if it involve any foreign citizen, expect the time to increase by 2 week.
P.S. : Just for taking your work, we do not mention 7-8 days, as its practically not feasible. Also please understand if a Company can be registered in 7-8 days, we will benefit the most as we will realize the payment the very next day.
However if Company is solely owned by Senior Citizen or Women director, we offer Rs 500 Discount and further 20% on all our professional fees thereafter