u/Rare-Assistance-6363

I am a new cadet on a container ship going to the Arctic. So far, the officers have expected me to work every single day for the duration of my sea phase (about 5 months). I know that legally they can do that. However, I have to do two sea phases worth of assignments in one sea phase. Is it unreasonable to ask for 1 day off a week to complete my school work? I just don't see how I can work an average of 65h/week on deck and do my assignments.