We have played 81 sessions since August '01. We play every second monday, with gaps for holidays.
The PC's are now about 12th level, but fairly strong for their level. I usually throw EL 16-18 encounters on them for the tough fights.
We also play between sessions on email. The intensity varies a lot, and was probably at its height in year 2 and 3. My archive now have 8943 mails in it, an average of about 7/day.
.Ziggy