This will most likely be a case of hours, while i understand people want to login early for bosses I would advise not camping as we cannot provide an accurate ETA at this time.
Im sure you know that clans need to coordinate and organize during resets. It would be extremely good customer service if OTM just simply overestimate and schedule the restart at a specific time, like 5pm BST, even if servers are ready at 2pm BST. Then if the servers aren't ready by 4pm BST, reschedule the restart to 10pm BST or even the following day. I think players prefer waiting extra hours as long as there is a specific time scheduled rather than having to camp the server all day.
There are two types of people in this world: Those who crave closure
A business is more profitable if they don't gouge and piss off customers.