How much no. of blog post in website in single day ?

regular post is good fora blog, 3 or 4 post in a week is the best

but strongly feel whatever you do it should be regular always remember 3R

R-REGULAR
R-REPUTATION
R-RELEVENCY

I think On a regular basis you can go for 3 posts a week.

Its depend on your readers, i suggest weekly 3-4 is posts is best.

I think daily one but it should be regularly

It depend on you. But you regularly do it. It is great to get update.