It all depends if you have enough Resource Credits. If you have enough for 5 comments then it then that is all you can do. However there is no limit by musing.io as such and are allowed to ask and answer as many questions as possible.
I have been fortunate enough to only be limited last week when the HF20 was happening and the patch was put in place. At that point I was only allowed to do roughly 28 questions and answers per day and now since then I have had no issues.