What is the ruling on leaving work before the end of official working hours, and is it sufficient to compensate for that by working extra hours on other days?

It is not permissible for an employee to leave before the end of official working hours or to be late for its beginning without an excuse, because this violates the agreed-upon condition. The employee is obligated to complete the full working hours because this time belongs to the employer by virtue of the contract, and leaving without the employer's permission is considered an encroachment on the rights of another.