There is a man who works on Big Bentley and..................he doesn't have to change the clock by even a minute. How?

Question

There is a man who works on Big Bentley and he keeps the clock running smoothly. One day the clock stops all together, he muttered to himself "It's going to take me all day to fix it!" and he grumbles while he works because he doesn't want to have to change the time, but he finishes by tea and he doesn't have to change the clock by even a minute. How?

Answer 1

He started at 4:00 and finished 12 hours later at 16:00 (tea time)