The most elaborate heads are ultra custom made to form fit on a persons head. This is done by making a lifecast, or mold of a persons head. Lifecasts can also be made of the body and hands. Some may apply one or more pieces of latex rubber, called prosthesis, shaped like muzzles or ears, to their head with spirit gum.
Say it's a basic brake job on the front end of a vehicle it can be 1.25-2.5 hours on average. Now that's if you replace the pads, rotors, and hardware. You could just slap on pads which may take 30-60 minutes. Now is scheduled ahead of time and the parts are already on hand boom bang not much extra waiting time. But sometimes there is an extra wait time on parts. Other types of vehicles can require a lot more labor hence time to complete the job. Domestic to foreign vehicle brake systems all very a touch to a lot in design and whatnot hence changing the wait time.
Generally, working part time is considered working anything less than what your employer considers full time. The Bureau of Labor Statistics defines part-time status as working on average between one and 34 hours per week. In the end, it is up to the employer to decide how many hours is part time and how many would make the job a full-time position. The Department of Labor does not differentiate between the two statuses. Part-time jobs can be found in all industries, but are most common in restaurant, retail and hospitality positions.