well if you want to do phd from abroad you can avail anyone of the following HEC scholarship

90% scheme
10% scheme(in this GRE is required instead of GAT General)
Faculty development for UET/UESTP'S(only for Engineers)

and as courageneverdies bro said these are for both MS leading to phd(combine) and also for phd alone.

In MS leasding to Phd its 4-5 years
in Phd alone it's 3 years however time may be extended with approval of HEC