my dad works in the automotive industry and he wants to retire in a view years
No way! Mine too! He owns his own shop in a small town.
my dad works at GM plant 
GM is a very successful automotive manufacturer
they hit a rough spot a few years ago and almost went bankrupt but the government saved them
Yep, but they sold 10 million vehicles in 2016, so they are doing well now
that many? so they have been selling more and more cars over the past few years then
Yep! In 2008 they only sold 8.35 million, so it is a fair bit more nowadays!
I think that is whey he wants to stay with GM and not retire, he will be missing all of the overtime hours
Working time
Working time is the period of time that a person spends at paid labor. Unpaid labor such as personal housework or caring for children or pets is not considered part of the working week. 
Many countries regulate the work week by law, such as stipulating minimum daily rest periods, annual holidays, and a maximum number of working hours per week. Working time may vary from person to person, often depending on economic conditions, location, culture, lifestyle choice, and the profitability of the individual's livelihood
He has one sister, Debbie. Nadeau was educated at Henry Abbott Technical High School and studied automotive technology. His family had connections to auto racing; Gerald raced modifieds at the Danbury Race Arena. Nadeau was given a go-kart by his father when he was four and one-half years old. He also worked with his father in the construction industry to support his career. Speaking about his father's role in his career, Nadeau said, "I learned a lot from my dad, Gerry, while I