I was spending 6-8 hours a night on it for weeks around 6 months ago until my computer couldn't cope with more than 80,000 population and the game grinded to a halt, probably for the best. My whole city was a mess though, in some areas I couldn't sort the traffic out and then I'd struggle to get workers into other areas even though the demand was there.
I did notice yesterday they are releasing a new snowfall update soon, looks great.