I try to keep a certain schedule.. instead of doing 1-2 full sites a day.. I do a little day by day schedule.. for example:
Monday - Research all day for niches and jot them down in notepad
Tuesday - Research good keywords for each niche I find, after that I write up content for all of the niches.
Wednesday - Finish it off.. build the arbisite with an already made template I have, upload to ftp, add my channels, and add the new campaigns to the search engines.
Thursday - Track and reap the revenue!
Basically something like that.. I try to track everything with an excell document to monitor my spendings on each niche/campaign to make sure I am atleast making enough profit.. if not, I ditch the niche.