hours of non-stop hours of nürburgring hours of observation hours of opening hours of operation hours of operations hours of play hours of pleasure hours of power hours of practical hours of practice hours of prayer hours of preparation hours of production hours of professional hours of programming hours of protection hours of pure hours of radio hours of reading hours of receipt hours of recording hours of research hours of rest hours of searching hours of sebring hours of service hours of silverstone hours of sitting hours of sleep hours of sleep a night hours of sleep last night hours of sleep per night hours of spa hours of storage hours of study hours of studying hours of sun hours of sunlight hours of sunshine hours of supervised hours of surgery hours of taking hours of talk hours of teaching hours of television hours of testimony hours of testing hours of the day hours of the morning hours of the night hours of therapy hours of time hours of torture hours of total hours of training hours of travel hours of uninterrupted hours of unpaid hours of usage hours of use hours of video hours of volunteer hours of waiting hours of walking hours of work hours of working hours old hours on a bus hours on a plane hours on average hours on end hours on friday hours on monday hours on saturday hours on sunday hours on the phone hours on weekdays hours once hours once a week hours one hours online hours only hours open hours operation hours or even hours or less hours or more hours overtime hours paid hours parking hours pass hours passed hours past hours per day hours per employee hours per month hours per night hours per person