Ahmed577,

If you use the Quick Reply box it will time out well before 30 minutes. Probably 5 to 10 minutes after opening the thread, after that it will time out.

Two options:
1. If the QUICK REPLY times out
You can RECOVER what you posted by using the BACK button, either through your browsers menu or on some browsers using the right button on your mouse and hitting back on the left arrow. Your post should be recovered.

Then you might want to copy the typed text to ensure it is saved. By using your mouse to highlight it and using the mouse and COPY or COPY via the browsers menu.

Use the REFRESH button on the menu or via your mouse.

The quick reply will be reset.

Your typed text SHOULD still be there.

If not PASTE it again as you COPIED it earlier to save it for this purposes.

Then hit CONTINUE and it all should still work.

2. Normal REPLY option
An easier way is to use the REPLY button on the last post or the post you wish to reply to. This will not time out and you can take 30 minutes to make the reply without the problems and fixes needed above.

for example above the text in my post is
EDIT REPLY QUOTE QUICK REPLY

Use the REPLY in the post, not the QUICK REPLY or the QUICK REPLY at the bottom of the thread and you should be fine.