It depends on the reason. Did you damage the leaves (e.g., put it in strong sunlight, or relied on a small root mass to support large leaf mass); or did you damage the roots (e.g., accidentally sheared off tender roots in the handling). In any case, move the air layer into the shade and water well.
If you merely damaged the leaves, in a few weeks you will see new buds.
If you damaged the roots, it depends how bad. If there was minor damage, same as above. If there was major damage, you basically have a huge cutting. It will try to grow new roots. But it may take 6-8 weeks to know whether the large botched cutting will live.