Over how many days did the risen Jesus appear to the apostles before His ascension?

Answer: 40

After His suffering, Jesus appeared to the apostles over a span of forty days, speaking about the kingdom of God, before He was taken up.

“After His suffering, He presented Himself to them with many convincing proofs that He was alive. He appeared to them over a span of forty days and spoke about the kingdom of God. After He had said this, they watched as He was taken up, and a cloud hid Him from their sight.”— Acts 1:3, 1:9 (BSB)