I try to spend most of my time on my forums as well as other forums with whom I am trading posts. Because once a forum takes off then you can sit back and enjoy ever growing traffic and content
Although I do try to do atleast 1 new story/news article per day which usually takes me about 10-30 minutes depending on how long/ in depth it is.
Then I spend the rest of my time link-building or playing games
as my site is about gaming! I am going to start doing about 20 links a day for the next couple of weeks and hopefully that should take me to the top of the rankings for my desired keywords!