You raised some interesting points in this post. Very high frequency of posting and resteeming could be annoying for some people.
It is difficult to give a number for that. The important thing to consider if the posts involved quality material.
Usually I publish 3 or less posts per day, plus some occasional resteemed posts.
However people participating in different contests, e.g. photography contents, could increase the number of posts per day. But as I wrote before, the important thing to consider is the quality of the material posted!
Glad to see you here, @nenio. Feedback from this post makes me understand that high frequency posting is relative and totally unacceptable by fellow Steemians. Secondly, people value quality over quantity. Limiting posting frequency to 3 times a day or less might be a better way to go with some occassional resteemed posts. Participating in contests is something to consider as well when Great response, @nenio! I really appreciate it. Thank you. Steem on!!!