Not enough info airtoni. First, I don't know the conversion from sq. meters to sq. ft. You'll need to know how much paint to get based on sq. meters or sq. feet.
We need to know if the apt. if empty or if it's furnished. Do you have any painting experience? Are you also painting the doors, jambs, mouldings and base trim?
I assume you are moving and want to paint it so you get your deposit back? If you can answer these questions, I'd be happy to give info to help you achieve your goal.
For an expereinced painter, a weekend would be a reasonable amount of time, with all the proper equipment.