I personaly do not think it is a clever tack to add minutes, if you happen to be charging T+M. Service charges and minimum charges are ok, the customer can take it or leave it, but I have had some customers who watch the clock like hawks. If I have told them there is a minimum 1 hr or some such, then thats the deal, regardless if I have only spent 45 min on the job. But, if I spent 45 minutes, charge em for an hour,and do not say so in front, I am going to hear some squaking from the clock watchers. Actually my state could label that as unfair and deceptive trade practices and spank me.