Depends on lots of things. Off the top of my head
- Is it all one topic or can you break things into different areas?
- How physically demanding is it?
- How much 'break time' can you provide?
- How much of a 'special opportunity' is it? [To elaborate: if you had a once-in-a-lifetime chance to do a workshop with a world class couple, you might want 6+ hours. Even if it was the same couple, if they're going to be teaching every week, 1-2 hours would make more sense].
Personally, in a 'public' workshop, I expect there'll be stuff I already know, stuff I'm not interested in learning, stuff I'm interested in but can't get anywhere with, and some stuff that I actually like and can learn. So it's not like most "4 hour" workshops will always involve 4 hours of really active participation.
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