Re an Oh Christ Hundred callout. In Eastern Europe it would in theory be 2 hours late, say 0600 rather than 0400. Central Europe 0500 etc.
Now would anyone consider seriously that our Lords and Masters would actually react that quickly? Either they were burning the midnight oil, say 8pm, and could therefore have give the order before midnight for a leisurely response at first light or for a true 0600 EST start a UK start between 1000-1400 after morning coffee and due consideration