@Ishayoe: No hurry, enjoy your D&D session with your friends. 
As for the numbers, it is my estimate for a two week period based on the limited available data. If you have CensusPlus scan results or something else useful in estimating numbers, I will happily look at them. However, extrapolating from WRP data suggest a max of about 50 to 70 horde and 765 to 790 alliance for prime time peak, much less during quiet times…