Increase the limit of 6 questions in 24 hours
Is this limit set forever, or is it increased when the reputation increases?
Everything on StackOverflow is rate-limited. And I do mean everything. The answer I am typing right now has a minimum and maximum number of characters that can be typed.
Looking at your profile, it appears that you can safely ask about one question per hour, and you appear to ask perfectly good questions. I applaud you for that. But there are a number of users who pepper the site with perfectly bad questions. Without some limits in place, these people would swamp the site with chaff.
It's not my business to tell you how long you can spend on StackOverflow, but six hours a day seems like a lot of time, even for myself. If you feel like you need to devote more time to the site, consider researching and answering some of the old, unloved orphan questions that are collecting dust. There's no better or quicker way to learn a wide breadth of programming knowledge.