What is the best time length for an online seminar?

What is the best time length for an online seminar?

I plan to give a live seminar that I expect will take up the morning, perhaps from 8:30 AM to 11:30 AM.

But I want to offer this via the web also. It will be live, but wonder if people have different expectations for webinars?

I have been told it should be no longer than 2 hours. But this would force me to make a shorter version of the seminar, and I wold need to take out important information.

What are your thoughts about the length and if I really should reduce the amount of content?

Or, if I take breaks and let people stretch, is three hours of sitting about the same, regardless of where it is?

newbiewebSr. Software EngineerAsked:
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David GipeCommented:
Keep it your regular length but I would advertise it as a "live" event which is also being streamed then present the information in logical sections / topics. This way, those tuning in online can view the parts important to them. When ending a section, thank those who may be tuning out for listening and those staying on, when it will resume. When starting a new section / topic, audibly thank those tuning in and those staying tuned in.

If the information was covering something I needed to know, I would hang around if I knew (1) what was being presented and when ... and ... (2) it was relevant to what I needed to know. Length wouldn't be an issue for me, if the interest is there and it is presented well.

One last thing ... for the sake of everyone, especially the web listeners, be punctual and stay on topic. Don't let those in the room hijack the presentation at the expense of the web-based listeners.
David GipeCommented:
... and make sure they can read / see what is being presented / shown and have download access to any deliverables you hand out.

To incentivize, you may want to give out something at the end of each topic; one for physical attendees and one for web attendees ... but don't know what kind of time or other assistant(s) you will have during the presentation ... in my mind, giveaways would be an optional thing.
newbiewebSr. Software EngineerAuthor Commented:
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