Study programs and its fact.

Hi Guys !
I am planning to study in Luxembourg. I want to know that how many hours per week non eu student can worrk there. Now I am 28 years old. Can I work full time in vacation.
I dont want to go through the luring words of education consultacy. Please guide me by telling the facts.

I am wanting to know similarly if I can take German or French classes in Luxembourg and get a part-time job while I do that? In Germany I know you can. I am American.