Investing your life savings into Bitcoin is borderline retarded and indicative of a low financial intelligence.
That statement is so true it hurts.
So what do you think is a safe/good amount of your savings to invest in Bitcoin? 20, 30 over 50 percent?
The key here is it all depends on how much savings you've got. Most people I know have life savings of less than a year's salary, and don't own any assets. For them, it would probably make sense to invest a lot, >50%, because they could make the money back by living very economically for a few years.
If you have a million dollars in the bank, then it would be pretty dumb to invest >50% of it IMO, I would say no more than 15%, more like 5%
But if you have a million dollars and own 10 houses worth a million each, why not invest 100% of your money? If it fails, sell one of your houses and you'll have your money back.
This is such bad advice. You're advising the guy who doesn't have money to invest a lot of it, and the guy who has tons to invest a little.