Is it permissible to read a book of fiqh during non-urgent work hours, provided that tasks are submitted on time, and what is meant by the concept of "habs al-waqt" (time confinement)?

The private employee is not permitted to spend contracted working hours on matters unrelated to the company's interests, unless authorized by the supervisor. The fact that there is little work does not justify such actions. If the employee finishes their work, there is no harm in utilizing the remaining time for permissible activities, as a private employee is entitled to wages by making themselves available to the employer, even if they do not perform work, as long as they have dedicated themselves to work during the agreed-upon period.