Longer than mine is all I can say.
Honestly, since there’s no standard, it’s difficult to define what a long signature is here. Perhaps vBulletin should give an option to have more than one signature for each account. Like a 56K modem user being able to choose “low-bandwidth” profile and signature option on the control panel and a 100Mbps fiber-LAN user like me could choose a “max-bandwidth” option. I don’t mind if there are lots of 19201080 WMV video in “embed src” tags right on the signatures that are put there for auto-run. Actually, such things have been quite common in South Korea since the mass-availability of MB/s home internet though most times it’s low-resolution video at 640480 max and just common MP3 of 128~192Kbps. Sometimes there are people who make multiple video auto-running in a single post. Sometimes there are even people who upload literally tens of 2MB jpg image files in a single post (like me.)