As per the project details mentioned above,
I have hands on experience in Java, Android & Smartfox Server and am currently working on a couple of multiplayer games for Android.
With previous experience in Mobile Technologies I can say that the work would be optimized for best performance on mobile devices.
Since the exact details of the project is unknown, the time I have mentioned above might change if the requirement is too high. But I would be able to tell the exact delivery time only after the complete requirements are known.