Basically there shouldn’t be such a thing as “time off” for server administration or customer support.
If the server is really down for maintenance (what I doubt if it is really down since more than 17 hours) then there should be some information on Steinberg’s web site or on eLicenser’s web site. But I couldn’t find anything.
If the server is down unplanned, there should be back-up teams that bring it up as soon as possible (and additionally there should be information on the web sites).
From a customer service perspective, this is really poor.