That's the wrong question.

How many hours do people spend doing research to be knowledgeable enough to earn merits? There, fixed if for you. Your learning is mostly going to be off-site.

If you want to give it a shot, good luck. If you don't want to educate yourself, too bad.

* If you like reading articles: https://coindesk.com/learn
* If you like reading books: https://theinternetofmoney.info/
* If you like watching videos: https://www.youtube.com/playlist?list=PLPQwGV1aLnTuN6kdNWlElfr2tzigB9Nnj

Security related:
* https://chainsec.io
* https://www.lopp.net/bitcoin-information/security.html

If you want to get more technical
* https://github.com/bitcoinbook/bitcoinbook#chapters