How long was the meeting for?
It's been reported as little as a one-hour meeting has qualified. Reading the T&Cs, there is no stipulation as to how long or a minimum rate. The biggest trick is getting the property to post it properly, if at all. There is a second system they must use other than what is used to post room stays.
Follow the line in whistlindiksee's post and learn more than you need to know.