Investment In F-16 Vs I-14, I-15, I-16, Bahria Town Phase 8

Which sector to be consider best return if we compare F-16 vs I-14, I-15, I-16 and Bahria Town Phase 8 considering current price value of plot in mind.

Secondly in property land, how much minimum to maximum time period is consider to be double investment?

In in all of the above stated places i would suggest u bahria town phase 8 which is an excellent investment now a days.. U cannot guess any time period to double your investment..it just depends upon luck..may be few months and may be few years..