Personally I have put more than 20% = ~40kUSD into the crypto space. I was only a signature away from a bank loan of 80kUSD in december which I am not extremely happy did not go through (would've bought BTC around 18k). In december my portfolio went from 20k to 81kUSD(was lucky to purchase DeepOnion around 2USD/DO and they hit 18USD/DO 7 days later, and today I am again hovering around 25-28kUSD.
Something close to 15% in my case is what I have invested in crypto and I do not have plans to expand in that direction for the time being, however never make the mistake of investing in something with borrowed money, if you fail at your prediction you will be many times worst than at the beginning and it seems one of the best things that happened in your life was that loan not being granted to you since you were about to buy bitcoin at 18k.