Clarifying, while most regular private individual speakers will be normally scheduled for the standard "5 minute" speaking timeslots, any well known representatives of popular orgs/groups/etc. will generally be allowed "10 minute" speeches if they so desire (and they will), and all celebrities, all 2018 candidates for elected offices, and any other actual VIP types may enjoy "15 minute" speeches as they so wish (and they will). The regional Expo event team will be personally working ahead of time with each different speaker who registers for a timeslot on the Main Stage, and should circumstances warrant, some speakers may be contacted again with offers to consider speaking for a longer timeslot and/or speaking for multiple timeslots.
Regardless, each different speech should be practiced in timing to last either ~4:30 for a "5 minute" speech, ~9:30 for a "10 minute" speech, or ~14:30 for a "15 minute" speech. Thank you for planning and practicing ahead.