not often enough to be an issue, does happen, but as above, go home, chill, enjoy a bit of down time, watch some porn, erm, i mean do some creative on line marketing, sorry!!!!! There is always something to do, send out some e mails to clients, stocktake your chemicals, tidy the van, top up some bottles, and if the worse comes to the worse, take your wife /girlfriend out for a meal or a coffee and chat to her..........