Depends on a lot; your age, where your working, the job at hand, the benefits...
Can anyone tell me how many hours allowed to work in a full day in germany .? 120 full days in year, is this includes weekends like (Saturday and Sunday) and semester breaks?
The Germans adhere to the European Working Time Directive. Details in this link:
24 ... 'cause that's how many hours are in a day.
Seriously, if you want their labor laws - try going to their government website.