- I got 5 months of internship in a company, then I got 3 months of probation period which will end at the end of this year.
- Another guy got an internship along with me for the same task, got a probation period and is now hired full-time (his internship was shorter, as he was already at the last semester of college, one semester ahead of me).
- The task is developing in a certain programming language that neither both of us nor most people heard of before (our boss gave us all the training).
- Besides the two of us, there's three other experienced professionals with the same task, including the boss himself.
- I currently work part-time in probation period 4 hours per day, 5 days per week, until I finish college. After that, I am supposed to work full-time too.
- I'm not the best employee (I'm okay, but sometimes below average).
- I don't intend to work there permanently, it's just a temporary source of income, as I aim working on profitable projects I have and starting my business, and I need time to work on it. So I'm not interested in having a career there, I just want as much money as I can get there, and my career will be my business.
- It will still take a few years until I can quit my job. The free time I would have working full-time is too few (~4 hours) and that would make it take twice the years. I can't take that much time to get the business running.
Now considering all these facts, my question is how should I ask my boss to keep working part-time without making him think every day he sees me that he is paying a replaceable so-so employee uninterested in the company and with an "expiration date"... or even if it's a good idea to ask this to my boss in this situation.
Edit: Thanks for the answers, I came to the conclusion that it's not a good idea to ask to work part-time in my situation, that would be too risky and it would have negative consequences while I'm there, so I think I'll really have to work full-time and work on my project on my tight spare time.