I realise the answer can depend on the niche and how much effort you put in into it, but how long was it before you started seeing some financial return on your blog? I'm interested to hear how long it took you guys to break even on your blogs, and if you want to share the niche and posts per week then feel free. I have a couple I'm starting to get some return on, but it has taken over 6 months for each.
I try and publish a post at least once a day until I know I can back off. I suppose it probably depends on the niche and where you are fetching traffic from.