Add alternative to 2-day workshops

[ndporter]

Adjust statement on commonality of lesson programs to indicate all share a "two to four day" format instead of just 2-day. This reflects current practice.

[github-actions]

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⏱️ Updated at 2024-05-10 18:09:08 +0000

[brownsarahm]

Suggested change

	- a two to four day format taught by volunteer instructors, and
	- a two full day or four half day format taught by volunteer instructors, and

a bit longer, but is this more accurate? or are some four full days?