Been following the 2ch FFXIV threads and there's one with 500+ replies ongoing (
http://2chnull.info/r/ogame/1289478946/301-400). According to them, this is the combined server population peak at JP prime time:
リーブ更新 09 21 無
┃10/07~10/09 ┃ 42217 39216 46499*
┃10/10~10/12 ┃ 47565* 45504* 41894
┃10/13~10/15 ┃ 40516 39502 36525
┃10/16~10/18 ┃ 43271* 44582* 39279
┃10/19~10/21 ┃ 38905 38339 36546
┃10/22~10/24 ┃ 24907** 40548* 40392*
┃10/25~10/27 ┃ 36309 35832 33867
┃10/28~10/30 ┃ 31553 32518 36264*
┃10/31~11/02 ┃ 36112* 33877 30929
┃11/03~11/05 ┃ 32672* 29031 29064
┃11/06~11/08 ┃ 32384* 33373* 28968
┃11/09~11/11 ┃ 28675 28052 27023
Considering how there's usually anywhere from 700-900 people max on Besaid at any given time (that I'm on, anyways - evening times EST), I'm not overly surprised at all. Also, some of the ASCII figures are just lol:
edit: shit looks fucked up with encoding, #388 in above link for reference.