A typeface family is an accomplishment on the order of a novel, a feature film screenplay, a computer language design and implementation, a major musical composition, a monumental sculpture, or other artistic or technical endeavors that consume a year or more of intensive creative effort.
Charles Bigelow
Source: TUGboat, Vol. 7 (1986), No. 3
Type design is a job where there is no room for easy solutions. Letters can perhaps be designed quickly using a compass and ruler, but these are unsuitable for a typeface, as they fail to satisfy the subtle optical laws that make reading enjoyable.