Do you know anyone doing this? I see people who say they have 2 jobs at the same employer - both FT positions - and that's how they are able to reach their financial goals. It sounds slimey to me, but maybe it's do able? Who am I to say. As long as it's legal, I guess you could do it, but you'd probably be burnt out as hell...
Perhaps this is where you got the idea from in the first place, but check out the subreddit overemployed.
I don't know anybody like that.
When I see what is possible in some corporates and how inefficient they can be, you could have two jobs and still work part-time if you could only focus on meaningful work there. 😅