How much money should I invest in cryptocurrency (bitcoin btc markets) ?

I would tell you that a penny should be enough, so that way you lose not  one penny.

Only as much as you are willing to lose.

look once currency is doomed for all nations .fluctuation of individaul dollars makes goods worth something .those in the EU might find there dollar competes with limited nations .staple foods sell more .cursing people lose instead of learning how to trade ..in my eyes asian cars western cars can trade if theres right economic values in leaders

What you can afford to lose and what you want to be playing with to try and make millions.

EVERY DIME YOU HAVE. You will lose 80% if you are lucky. Probably 100%.

That is not investing, that is gambling. So go ahead and gamble as much as you can comfortably afford to lose. The purpose of investing is to risk money with the objective of making a product or service which generates more money. Cryptocurrency and day trading are both just gambling.

Only what you can afford to lose and I wouldn't have it more than 10% of my total investments.

Not that much. They’re rapidly fluctuating. Invest in the stock market instead.

Only invest what you can afford to loose. Maybe invest 10-20% of your portfolio in bit coins.