Ummm they are longer than 3 day's and you do not attend all 45 sessions lol....you pick and choose which session or sessions you would like to attend. I went to one NACE conference and I only attended 3 sessions in one day and the extra 3 days I had, I went sightseeing/club hopping and I slept a lot.
Your trying to talk about something you know nothing about
Why would I care how many sessions you attended?
The cost of the conference is based on the # of sessions they have to facilitate, the # of rooms they have to use, the # of staff they need to facilitate that many sessions simultaneously, and the # of days they had to do that shyt, not the # of sessions you choose to attend.