Keeping blogs up to date and using unique niche relative posts would be the essential issue and I don't think there would be ceiling posts for daily blogging. Have a nice day,
I got 3 blogs with almost the same niche and they got posts alternate from 1 content review I made a day..
I post on my blogs when I have something to say. That could be several times a day during some periods, at other times it could be once a month. It all depends on if I have the time and inspiration to post something.
I don't think so there is any number fixed but you should use niche and unique content. you can also update your blog once or twice in a week.
It depend on you that how much posts you can write because rich content make your post more popular over internet.