My bad genuinely thought I had posted that yesterday and didn't check the time stamp before I had posted again
Pal replies: an easy way to know whether it's safe to attach again in the same thread is to check to see if you still get an "Edit" link on your prior post. If you DO see the "Edit" link there, that means that 24 hours haven't passed yet (24 hours is the allowable time to edit a post) so you're still limited by 1-1-1. If the "Edit" link on your prior post is GONE, that means that more than 24 hours have passed since then, so it's safe to attach again.
Or you can just refer to the time stamp on the prior thread, and compare that with the current system date/time in the upper right hand corner of each page.
Thanks. -Pal