Answer to you questions, about 4-5 days with 3-4 hours sessions.
Always at your night time i guess, and i am not playing to spend time beggins someone, this is boring.

And i wish to tell you short story.
I am a programmer,
and first my job at 2001 or so was in company specialisated on self-made personal palm computers Cybiko
(perhaps you have heard something about it)
We were releasing one game per day, all games were free for download on our web site.
I am not sharing here any comecical secrets, this company doesn't exist any longer, as far as i know.
So.. we had global rules to write our games, so called "holy cows", i can't remember exaclty formulars,
but in this rules or dogmas were decribed system of rewards for player for right moves in game, and this
dogmas were researched for player's joy.
First rule sounded like:
1) Never punish the player and make him feeling bad, because he will throw this game away and start another
There were plenty of over interesting ideas, not for one exactly game, but global philosophy for game industry.

So the point is, do everything to make player enjoy the game, or you gonna loose him.
And CF turned into championship, hard working, seeking Imm-love and has less and less fun (sure i am talking about myself personally)
And i think this is not fun for me anymore, i have a lot of challenges in real life to spend my soul and nerves here.
I am no longer enjoing playing this game.