Then it makes no sense to me that you play a timecontrol that can easily make the game last that long. Let's say you use only 3 minutes per move and the game lasts for a moderate 30 moves. That's 3x30=90 minutes per side and 3 hours for the game.
I don't know how many games you have played or for how many years you have played. Personally I have played for 20 years and I do have a need for 3 hour games. Perhaps it's because I've played almost nothing but 5 and 10 minute games during those years. Now I've finally begun to play rated games and I find it to be fun. But it's a nightmare to find people willing to practice with anything over 10 minutes/game.
Although 10 minutes/move would be somewhat close to a longer game, I just don't see the point in not being able to decide for myself where to put the bulk of my time to use. But if it works for you, have fun with it.