how often do handwashing facilities do hand hygiene visits how often do hygienists go outside of a hospital how often are hand hygiene observations done how often should a hand hygiene observation be done? how frequent is bacterial hygiene observation how long do hygienists observe hand hygiene hand hygiene observation how often how many hours does hand hygiene last how often does a hand hygiene observation have to be carried out how many external hand hygiene observation how much time do hand hygiene observers do in a hospital how long does hand hygiene observation last how much time is required to observe hand hygiene in a hospital how often does hand hygiene observations need to be done how much hand hygiene observation hand hygiene how many hours do other facilities observe how many hand hygiene observations per month how much time do you need to do hands hygiene hand hygiene observations how often how often do hand hygiene audits take place