It is great to see you want to do some revision over the holidays so you dont forget anything but remember to take breaks and do things you enjoy.
Is there a reason you would like to set goals in terms of hours rather than tasks? If not, I would recommend thinking about what you want to get done in the holidays and split them into realistic tasks e.g. Monday - cover X topic and answer X questions, Tuesday - Mark the X questions you did, start another topic etc.
I wouldn't give yourself the same amount of work everyday as you might burn yourself out so allow for some days to do less than others.
Burning out before you go back to term will not be helpful at all!