Agreed, WGT need to give us more lead time on downtime notifications. How long can a 4-player 18-hole Stroke Play round take? A lot longer than an hour; with the between-holes delays, a few false disconnects and a group of slow players I'd guess close to three. So to be fair, notification should be at least double that -- six hours minimum.
If, by six hours in advance, your people are not sure whether a downtime will be able to take place as scheduled, you can give the warning as "downtime is tentatively scheduled for...", and then when you're sure you will meet the timeline, change it to "downtime will begin at...", or else if you fail to get the preparations done, change it to "tonight's previously scheduled downtime has been postponed until..." Simple. Effective. Keeps your members informed. Everybody happy.