How big is $20 worth of weed?

Excuse me, I'm curious about something. I've been hearing people talk about purchasing "weed" with cryptocurrency, and I was wondering if you could shed some light on the subject. Specifically, I'm wondering how much "weed" one could typically expect to get for $20 worth of a cryptocurrency, say Bitcoin or Ethereum, for example. I understand that the exact amount might vary depending on factors like location and availability, but I'm just looking for a general idea. Could you please provide me with some insight on this matter?