There is obviously a confusion between hobbies and past times, by definition a past time its just that, a doing just to past the time, some sort of entertainment or occupied the mind in a task that serves to not be aware of time. Where a hobby is a more complex task that involves, time, skill sets and investment, not just to fulfill the desires of the accomplishment of something for a gain, either knowledge or reward, but it also serves as threshold of what it could be a career.