There are no such limitations set by musing. Musing is a frontend to steem blockchain and more specifically All the question and answer you see here is comments and replies in a post that musing uses. If you follow the link steemit.com/@musing-threads you will find there posts with thousands of comments. Those comments are the actual Q&A that you see here.

Now steemit doesn't have a limitation on what ammount of posts you can make. but you have bandwidth allocations. I have 24 sp and my bandwidth allocation now is more than 32 mb. If I post something that has a size of 32 mb that will drain my posting ability and believe me its tough to drain it.

So the answer to you question is no and yes. They have a limitation but it will take you more than thousand question or more to max out.