If there were degrees for demonstrated ability to make typos, I'd have a PhD.
I have noticed that when I edit my typos after submitting my post, this goes unremarked if I do it quickly enough. After a certain time, my carelessness is exposed by a 'last edited...' label attached to my post. How long do I have to rectify my faults before I am exposed?
ps. I have added this ps for two reasons:
1. to see if I have done it soon enough to be exposed
2. to say that this is simply curiosity - no hint of complaint
You should have 5 minutes in which to edit your post before the 'Last edited...' message is displayed.