I'm looking for a way to get a live timing list when i'm racing a offline 24hour race. Is this possible to a second screen or through LAN for another computer?
Yes it is possible since live view plugin generates data also for stand alone offline game. But... my LiveView system is designed to be web-based so additional servers (ftp/http) must play the role.
GTR2?
LVplugin is dedicated for rfactor.
For GTR2 only dedicated server may generate live data. So, in that case answer is: no - you cannot use live standings for offline game.