If you were an old ArcheAge Unchained player, you will receive free subscription time as following, after transferring your account:

TypeFree Subscription time
All old ArcheAge:Unchained players+ 60 Days
All old Garden DLC players+ 30 Days
All old Gunslinger DLC players+ 60 Days

To activate this free game time, you will need to visit your Account Web Inventory page and claim it there.