Is 12 hours per day normal?

Hello all, I recently joined a company as a junior c++ programmer about 2 weeks ago. Everyone works here more than 12 hours. They come at 9 am and leave around 10:30 pm. I dont have much experience and graduated recently. Is this normal? I like the work but wondering if is it ok to leave around 7:00 pm? Will it look like i am not committed enough? How should I tackle this?

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