WotLK whats the current inactivity rules?

[limblesssssss]

how often do i need to log in?

[angrylol]

Last time inactivity cleanup was in february, condition was characters not logged since July. So if you log at least once now, most likely you will be excluded on next cleanup.

[Mitzen]

Inactivity Cleanup and Gold Squish for a healthier economy should answer your questions.