Fifteen minutes. He'll give himself fifteen minutes to soak and scrub, wash his hair and let himself slough off everything that kept him from feeling human. Little by little his muscles unclench and it's all him. Relaxed and loose and easy. He shuts off his water at the ten minute mark and grabs a towel from his bag, tucking it around his hips while he wanders over to the nearest mirror for a quick shave.