I would be curious now that we have a lot of data in for most servers to see a query that added together either the highest alliance population count and the highest horde population count for any hour or the highest total (horde and alliance) population for the hour with most population for that specific server.
Pasted Bleeding Hollow prime time numbers below:
18 1453 1 1323 19 1.1 : 1
19 1405 2 1331 30 1.1 : 1
20 1556 4 1422 34 1.1 : 1
21 1642 2 1483 32 1.1 : 1
22 1398 3 1495 33 1 : 1.1
23 1585 6 1446 38 1.1 : 1
For BH the max total would either be 1642 + 1483 or 1642 + 1495 depending on which calculation is used. The reason I'm curious about this is of course that number of characters tend to be inflated for new servers and somewhat for rp servers and deflated for servers with major queues since the very fact that they have big populations make it hard to create characters there. Usually quite a few servers don't have enough data for this but right now most servers appear to have enough data for reasonable numbers.