How much tax on 1 million crypto?

Excuse me, but I was wondering if you could clarify something for me regarding cryptocurrency taxation. Specifically, I'm curious about how much tax one would typically owe on a million dollars' worth of cryptocurrency. Is there a standard rate that applies, or does it vary based on factors like the type of crypto, the length of time held, or the country's tax laws? I'm trying to plan my finances accordingly, so any insight you could provide would be greatly appreciated.