It all depends on why you are doing your site. If you are doing it as a hobby trying to figure out how to make money online, by all means choose the least number of times to work on your site and you will do just fine.
If you are really serious about making a living of the site, you have to take as seriously as a business. Imagine if you went to a 711 and all it had were 3 items? Would you buy there or leave?
A lot of blackhatters say they make lots of money from their 5 page websites. Talk to them after 6 months and they are complaining about google panda, penguins and all sorts of animals. A thin site means lower than possible revenues. A larger site means more work but you can expect your income to increase.
So how many times? It's your choice. I do 3 a day consistently. I even ask other bloggers to add their own articles. The results cannot be doubted. Never once have I seen a drop in earnings from the previous month and I'm not going to let that happen because of listening to the crowd on black hat forums.