On Dec 6, 1:17*pm, Tom wrote:
That should read - *4, one hour presentations.
Tom

Yes - one of the deficiencies of American English (in addition to the
lack of the inclusive "or") is the reluctance to use hyphens. We
Brits would have written it "four hour-long presentations", which
would have been unambiguous.

Report back and let us know how sign-ups are going.

Mike