Each time I pick a new paysite to make free sites for I get all the content in order, make the thumbs. etc, I usually spend a whole day doing that, but then I have content and thumbs and all that good stuff ready to go for usually at least 20 sites or so just for that paysite. I make my designs pretty simple and clean but I write ALOT of unique text for each site, usually a good size paragraph for each page. On a pretty simple one I can make it in a little less than an hour on my more elaborate ones it can take a little less than 2 hours, but usually its around an hour and 10-20 minutes. I submit a free site every single day, but I try and build at least 2 a day, 2 a day I consider a decent day, 3 a good day, any more than that and its an awesome day
There have been days where I have built more than 5, I think a couple days I have built 7 or more. I submit a free site every single day, so I obviously am building more than I can submit but I do take the weekends off from building and since the weather has got nice I have been slacking really bad on building. What I build and cant submit yet I just incorporate in my network of sites I am starting and it sits there waiting for its turn to get submitted. For example the site I submitted today I built in March
Submitting is really quick and easy for me, usually takes less than 10 minutes since I have only been submitting to 12-15 sites and the handy dandy robo form. I do plan on expanding my submit list to around 30 and make a mirror, but I havent figured out yet how to exactly go about that just yet.