Answer: -The hours are as varied as any service industry. I work for a specific company with set hours. I work from 5AM to 1:30PM, but my days fluctuate. If you start your own business, you can pretty much count on 24/7 type hours, as you will be on-call for just about anything. I am also on-call all the time, but with the crew we have working, things rarely break and I have only been called in about 4 times in the last two years. -There's plenty of scope for traditional daytime hours, as well as evenings if that's more convenient. My father works from 1.30pm to 10pm five days a week, and most companies will come to some arrangement, as there's such a shortage of good plumbers. It's a sellers market at the moment, though that may well change, as more people realise the huge money in plumbing and get in on the act.