Its not like kollege where yu write a program, make it work, and then are finished.
In a business a lot of other thing go on:
planning
specifications
coding
check into codebase
TESTING
WRITING TESTS
fixing bugs
tracking bugs in a databse
selling the idea
selling the software
supporting the customer
managing all the people that do this
learning new technology
teaching the new people
maintaining the computers to some degree
All this stuff occurs whether you are a single consultant, part of a small startup company, or part of a mega-software company.
In a small software company you probably have the mode overall hours devoted to coding.
A single-consultant is probably spending lots of time on non-coding aspects above.
A large company has specialists handling things like selling and testing. The fraction of everybodies hours devoted to coding may be rather small, less than 20%.