Hi
Could yopu please elaborate a bit .
If you want to track how many people have been logged out due to session time out than you can place a page level tracking on the modal ( if you are using) otherwise visit are auto tracked respective to the user inactivity which means after every 30 minutes of the inactivity ( visit configuration is kept as default setting) it will add one more counter to the visit matric once user become active again.
Regards
Devinder ,devinder.banga@mirumagency.com
Sr.Consultant