Hii..

To get that much good post in any top company with experience you also required skill..

as you asked how many years of experience required to become manager in P&G company so its depend upon your skill if you are  skillfu and you have only 3 year of experience or 5 years of experience but you have a skill to manage everything in a good way then you will definitely get that post in just 5 years of experience or it may go more.

All the best!!