A tech employee is being paid for their work. The company assesses the employee's ability and dictates the level, which determines how much work they believe the employee can handle in a typical 40 work week. The balance a company hedges against is the company paying overtime for overestimation of the employee's ability, or under utilizing the resource i.e. the employee.

Generally, if you want to work less it's an option to take an easier job. However, in this instance it seems a severe underutilization to pay a tech salary (40hrs) for potentially (55/2)hrs of work. The company isn't getting it's due, and likely the employee isn't either.

It doesn't matter if its underutilization if they are being paid market rate for the amount of work they are doing. It's a fair trade.