How much fiat generally speaking should a single 26 year old man have for emergencies?

My current strategy is to just build up a certain about of fiat cash up to like a baseline point for emergencies, say like, what, 20? 25? Then just invest everything after that in hard assets (not necessarily pure bitcoin, but you know what i mean) Bitcoin. stocks , precious metals, commodities, etc. especially with interest rates coming down, is this a good strategy?