Why did Lee wait a month between the Battle of Chancellorsville and the move into the Shenandoah Valley?

Lee waited a month between the Battle of Chancellorsville and the move into the Shenandoah Valley to regroup and resupply his army after the heavy casualties sustained during the battle. This pause also allowed him to reassess his strategic objectives and plan his next moves carefully. Additionally, it gave him time to monitor Union movements and prepare for potential engagements, ensuring that his forces were in a strong position before advancing into the Valley.