Technically there is only one limit one how much you can ask or answer here on musing.io. That limit is basically your bandwidth limit. If you exceed your bandwidth limit on the Steem blockchain, then you won't be able to publish or write more content. You can check your bandwidth on steemd.com by using this link: https://steemd.com/@ammachemist
This is how the bandwidth bar looks like on steemdb:
This means that I have 99.99% of my 2.25 GB bandwidth remaining.
Asking questions and writing answers on musing.io is just like publishing content on Steemit or any other steem dapp. Since musing is built on the Steem blockchain, therefore the same rules apply to it as well.
Note: Text takes a very small amount of space. Therefore a ton of stuff can be written with just a few mega bytes of bandwidth.