In economics, activities done for others, such as providing house cleaning or dental work, are referred to as

In economics, activities done for others, such as providing house cleaning or dental work, are referred to as services.  Tangible merchandise  on the other hand are referred to as goods. When firms produce  services at the lowest cost productive efficiency is achieved.

In economics, activities done for others, such as providing house cleaning or dental work, are referred to as services. Services are also a part of economy which are produced and consumed at the same time. Services are intangible and one can only feel them. In many developed economies, services form a greater part of economy than goods.

9 hours.
You work for 3 hours and 45 minutes, then take a 45 minute break, starting work again at 12:15, working for another 5 hours and 15 minutes, leaving at 5:30.
9 hours of paid work in total.