How long does it take to become a blockchain developer with no experience if you sit and study 6 hours a day? How hard is it to find a job and what is better to choose rust or solidity?
No exact timeline with that since it all matters depends on how you understand the teaching given to you also how eager you are to became a Blockchain Developer. Also its not automatically you became like that if you don't have a passion to became one and just think about it since you just like the idea or the possible salary that you can possibly get.
You need to stick your head learnings a lot of things and be sure that you are committed on what you want to learn. Blockchain dev task and to learn it is not easy as you need to deal with many things.
Try to research more information about it since there are lots of ideas available online. Just be consistent and everything will follow.