Better to save up enough money to live on semi-comfortably for a year or two (say, $200k) and make a leap out of the ratrace. Start a business that has the potential to generate a large amount of income quickly with low startup costs and be sold as equity for a high price after some time. Fail, and repeat for the next two years. Hopefully at some point you will get cash flow positive and will not be forced back into the rat race. If you've played your cards right your incoming cash flows will largely be passive, leaving you the freedom to expand into new areas in the quest for high growth. One can imagine that after 5 years of being out of the rat race, you will end up stumbling upon a high growth business that can start bringing in serious cash.
After 5 years of effort you will hopefully have $1-5m. You almost certainly will have more than the $250k you started with. Provided you have been smart and not increased your standard of living as you earn this money plug it into safe, income generating investments like bonds, CEFs, and dividend value stocks.
Congratulations, you can now kill off any income streams you may have had that were taking up time (and were not passive) and can decide if you want to live on the interest or continue searching for more growth, to get you to that $10m point where the interest starts being "I think I will buy a new car today" levels. You're also probably in your late 30s early 40s and can actually still enjoy life.