After how many days did Mary and Joseph find 12-year-old Jesus in the temple?

Answer: Three

Jesus' parents returned to Jerusalem to search for Him, and after three days they found Him in the temple courts among the teachers.

“When they could not find Him, they returned to Jerusalem to search for Him. Finally, after three days they found Him in the temple courts, sitting among the teachers, listening to them and asking them questions.”— Luke 2:45-46 (BSB)