[taro]

It depends. Some companies that are in financial stress, ask a lot to employees. New entrants will be given a lot of work even after official working hours. You should be prepared for it. Of course this depends on your supervisor. If you have a good one, he or she (mostly he) will try to take your workload a bit. But sometimes that is to be compensated going to a (or some time several in a night) drinking place (nomikai). Whatever it is, take this as an opportunity to know a new office culture. It will help you later on.