D2L Timeout Period
Entering text into a discussion post text area does not reset this session period.
D2L sessions time out after an hour and 30 minutes of no activity.
It is recommended that if you have to type a discussion post to submit on D2L, to type it in a dedicated word processor (Wordpad, Microsoft Word) and then copy and paste the text into the D2L discussion text box. This will prevent you from losing what you typed if your D2L session times out.