I'm actually working toward Coast FIRE myself, and I totally get where you're coming from. That "how much is enough" question is the hardest part. The idea is to frontload your investments so they can coast over the next few decades while you just cover your living expenses. But the exact number depends on so many things: your desired retirement age, expected expenses, current savings, and even the return rate you're assuming.

I found this really helpful calculator that breaks everything down based on your numbers — it actually shows you the exact amount you need to save now to “coast” to retirement backofnapkin.co : . It lets you input your age, retirement goal, current savings, etc. and gives you a very personalized target. When I ran mine, it turned out I needed around $120K invested now to stop contributing completely and still hit my FIRE target by 55. That felt both intimidating and motivating, if that makes sense. I'd definitely recommend giving it a try and playing with the assumptions to see what moves the needle most for you.