The more you can save the better. If it means living with your parents for 10 years for example do it.
You just need to do it for 10 years and you set yourself up for life.
If you do $1k/mo for 10 years your setup looks like:
year 10: $189k in portfolio.
At this point, you can stop adding. Just bank all your salary and start living.
Year 20: $449k in portfolio. At this point you can take 2% loans. It's not much, but it's $13.5k per year. But if you're mid 20's now, then this is when you're 55, so you're still working and have an extra $1k/mo.
year 30: Your principle is $1m - Your yearly loans are $31k.
It's not much, but it's $3k/mo for doing nothing. Decent retirement.
It compounds quickly from here though.
year 35: You can start to take 4% loans at this point. You're probably mid 60's. You have a good 20-25 years of great life left if you took care of yourself.
With 4% you've got $65k/year at year 35
$100k/year at 40, then by year 43-44 you'd reduce to 3% as you're approaching LTV of 40%.
It's decent. You give up $1k/mo of lifestyle spending for 10 years when you're young, in exchange for age 55+ having increasing tax free monthly amounts until you die. Your 60's, 70s and 80's would be relaxing, travelling, spending time with friends. A good life.
The technique works to get wealthy, and it works to just have a comfortable life. Depends how much you bank.