Implementation time consists of mostly two tasks. First is a question of game design - selecting place and time within the game of when to utilize Monetizr. This is often done together with person who handles game design. This can take most of the implementation time.
Secondly it's a technical question - how fast can the plugin be integrated and tested. A simple test through a plugin should not take up more than a day of work. An API integration will take more time and it can vary greatly.