I don't actually spend much time on each game. Instead I spend most of my time developing my AllBinary Platform then occasionally making a new game.
All game designs are mainly generic to me.
10 years in my AllBinary Platform
1 year for 15 games
I spend a bunch of time doing new builds for new platform features like right now I am adding HTML5 versions.
According to https://www.ohloh.net/p/AllBinary-Platform/estimated_cost
I have 56 man years for about half of my code.
So I have about 100 man years of code because I wrote code 7 days a week 10 hours a day for 10 years and did not focus a bunch on design or complex code and just meld in feature after feature.