How many spies did Joshua secretly send to look over Jericho?

Answer: Two

Joshua sent two spies from Shittim to inspect the land, especially Jericho; they stayed at the house of Rahab.

“Then Joshua son of Nun secretly sent two spies from Shittim, saying, “Go, inspect the land, especially Jericho.” So they went and entered the house of a prostitute named Rahab and stayed there.”— Joshua 2:1 (BSB)