I agree 90-days is not enough time. A year is what it should take. But i have to make the best of what i am given and i decide whether or not based on their previous experience and their progress whether or not they get to continue working there. We do allow guys to stay in training for specific cases where they need to learn more. It sounds like that guy didn't understand the concept of cleaning a main line very well. And then he expects the customer to pay for his time even though he didn't fix the problem. It's his fault he used the wrong c/o, and wasted however many hours he did on the line. He has no right to charge that much. His office wouldn't let him keep that money if the customer called in and complained. If your not making any progress in an hour your doing something wrong or the line might have a problem. I never spend more than three hours cleaning a main, it just doesn't take that long. I would never do anything as stupid as that guy, and if i did, the customer certainly wouldn't have to pay for it, I take responsibilty for my own actions. Every line i haven't been able to get open - which is rare - was broken. Verified with camera and replacement. But in summary some of our guys do not have the skills and knowledge to become competent plumbers and those are the guys that give us a bad name, and usually quit within a couple years or get fired for side work.