One day is an introduction
A day trip can combine one viewpoint or short walk, a scenic drive, and Uptown or Tlaquepaque. It is vulnerable to traffic, full parking, heat, or storms, and it rarely supports both a substantial hike and a relaxed town experience.
Two days fit a focused first trip
Use one morning for your highest-priority outdoor plan and the second for a different landscape or guided experience. Keep afternoons for lower-exertion scenery, art, food, or rest. This is enough if you are selective.
Three days create flexibility
Three days allow an early trail day, a scenic or guided day, and a flexible block that can absorb weather or congestion. It is the best general recommendation for a first visit because it reduces the temptation to cross town repeatedly.
Four days or more support excursions
Add time for a Verde Valley wine trip, Jerome, a long hike, or simply a slower rhythm. Do not count a Grand Canyon day as a Sedona day. It is a separate, long outing with its own logistics.