How much time it take to make 2 game on unity with c++ for android?

Answer 1

This is very hard to answer. It depends upon many things such as developer skill, amount of developers, how much time you put into it a day, and the size of the game. And Unity does not use C++. If you want to use C++, try the Unreal engine instead.

Answer 2

You cant code in Unity with C++ i think.
You have to use C# or JavaScript.
Then for a very simple game (like an endless runner) you need ca. 5 hours.