Apart from whether the days are enough or not to wean off a long-standing addiction. Maybe a 3% boost in working memory has compounding effects over time as well.

You can't commit to long term memory what you can't keep in working memory long enough. You can't think about complex things if you don't have the working memory capacity.

If you always have 3% more working memory you might accumulate more knowledge after a while.

Like alcohol doesn't delete your brain, but you have serious memory deficits if you drink every day for years on end.