At a recent auction that I attended in person, I witnessed a case that was about to be knocked down for £100. On the spur of the moment, I stuck in a bid and bought the dozen bottles for £110.
First bottle opened was left to breathe for a couple of hours before I attacked it. However, the first glass suggested that a £2.99 bottle from Tesco might have been better...

But as I worked my way down the bottle it got better and better.
Second bottle I played a hunch and decanted it, using the funnel and gauze strainer I use for VP. I also decanted into a magnum ship's decanter, to give maximum aeration.
Without further delay, I poured a glass about 5 minutes ago.
Wow! - the difference between this and the first bottle could hardly be greater - this is now a class wine.
Now I don't pretend to be an expert on Bordeaux, and this is a snapshot observation, but it does suggest that aeration has a much more rapid effect on unfortified wines.
It also suggests to me that if you have some bottles of table wine that are distinctly rough and heavy, a decanter may be the answer.
Tom