Mercury goes retrograde about three to four times each year, with each retrograde lasting roughly three weeks. The exact dates shift each year due to Mercury’s 88-day orbit around the Sun, but the pattern is consistent: a few short retrograde intervals annually, plus a pre-shadow and post-shadow period around each retrograde. For 2025, sources note retrogrades roughly within March–April, July–August, and November, each spanning about three weeks, with additional shadow periods before and after. If you’d like, I can pull the precise 2025 dates from reputable sources and present them in a clean list.