We have coded a fix to the session timeout issue that will allow sessions to remain active >24 hours, and we are testing it today, and will deploy it as soon as we can. I'll update here when I have an ETA for deploying the fix.
Currently sessions time out after 60 minutes, and if your session times out while you are composing a post, you will likely lose your post. Until the fix is deployed, please copy your posts to a clipboard before you submit them.