When Gideon let the fearful go home, how many men turned back?

Answer: 22,000

Twenty-two thousand turned back and ten thousand remained, still too many, so the LORD tested them at the water.

“Now, therefore, proclaim in the hearing of the men: ‘Whoever is fearful and trembling may turn back and leave Mount Gilead.’” So twenty-two thousand of them turned back, but ten thousand remained.”— Judges 7:3 (BSB)