I love this game and when I get back into it after not playing for a year or two, I have a hard time letting go!
I play while surfing or working because I almost always let it run in real-time which can be days!
It just runs in the background and I'll peek in to assess the situation, make moves like launching aircraft or adjusting fleet routes as necessary and so on...
It may be slow for some but if you like moving as slow as a Carrier Fleet across the GIUK Gap, then you may like it.
There is a lot more to it than just sitting around and it can be a VERY complex game to play!
I just love it!