The advantage of Mercury's return to a nostalgic and reflective part of your chart each year is time to hear yourself think. Mercury will often move through during the month long wind down of your old solar year, with a mix of intuition and logic, imagination and intelligence making it easier to process the year that's been. The only downside is that Mercury normally moves through in just 15 days. Yet four weeks before the wind down of your old solar year begins Mercury returns and he's going to stay with you right through.