At the moment I co-own a forum and I would say out of all my time daily I would spend around 10% of it at the moment on the forum I co-own. I would love to spend more on it but at the moment work has been very much crazy and so that has been taking pretty much most of my time. I am hoping when things slow down a little I will be able to spend a lot more time on the forum.
My own site is a pretty small forum for a small group of people, so my focus on it is practically non-existent. I'm there a lot to chat and interact with a group of people I've come to care about dearly, but I don't put too much work into it anymore.
One of my sites makes at least $100 per month from, adsnese, so I am very much focused on this site (100 percent motivation). One of my sites got rejected by adsense half a dozen times and I do not have any motivatrion to work (zero motivation)
On days that I'm home all day long, probably about 50% - 60% seeing as I remain on the computer and check my forum frequently throughout the day. On days that I'm not home all day probably about 20%.