Everyday, especially after work.
In my line of work, you have to! And I have a more detailed, thorough shower if I have "one of those days" at work:: lots of trauma, blood everywhere, I-can't-do-anything-else-right-now-because-my-hands-are-inside-somebody's-chest-performing-internal-cardiac-massage kinda days y'know? Who knows what kinds of cooties you bring home to the family?
cheers,