This will be addressed one time and only one time.
One of the seven criteria a moderator may use when removing a post is Author Asked to Remove.
It is pretty black and white - if someone asks that one of his / her posts be removed, AND it falls within the allowed timeframe - a moderator will remove the post.
Otherwise, that poster would need to take it up with board admin.
And as far as how soon a post is removed - sorry, but the three of us do not monitor this board 24/7. We remove posts when we have time. Sometimes it may be within a minute, sometimes it takes much longer.
And yes, sometimes we miss things. It happens.