Please allow the showing confirmation window to be as soon as 1 hour before the showing (24h is WAY too far out). Reminders are insufficient; there ne?

Please allow the showing confirmation window to be as soon as 1 hour before the showing (24h is WAY too far out). Reminders are insufficient; there needs to be action taken by the prospect in order to opt-in to the showing on the day of (within a couple hours). Opt-out (ie, click here to cancel) doesn’t work.