For N <= 8, making allowances for lunch hours and breaks.
Short periods of time (measured in days, not weeks) can be spent working for N > 8 hours per day, but it becomes counterproductive (from the employer's business standpoint, not even considering employee health or satisfaction) beyond a few days in a row.
Short periods of time (measured in days, not weeks) can be spent working for N > 8 hours per day, but it becomes counterproductive (from the employer's business standpoint, not even considering employee health or satisfaction) beyond a few days in a row.