Which level of management has the job of complex nature that is stressful, demand long hours, and commitment to the organisation?

Top-level management

The top-level managers are responsible for the welfare and survival of the organization. They analyze the business environment and its implications for the survival of the firm. They formulate overall organizational goals and strategies for their achievement. They are responsible for all the activities of the business and for its impact on society. The job of the top manager is complex and stressful, demanding long hours and commitment to the organization.