hi, 1.5 months enough to build it as whole, i am an active player of battleship game myself, would be more than happy to build it using the Unity's photon engine for multiplayer 1vs1 and single player in 3 weeks agains the AI, I am a Pro iOS & Android Game/App developer here, I always strive to finish all my projects, also please check my latest reviews, portfolio on my profile page directly, Kind Regards, Iryna!