Employees who work excessive hours on a regular basis are unlikely to be consistently effective or productive, and employers that condone extreme working habits may be in breach of the common law duty of care.
Where an employer identifies a "workaholic employee", it should review the employee's job responsibilities and duties to determine if they are burdened with an excessive workload, and introduce any necessary changes.
The employer should consider if it is appropriate to require the employee to take a period of annual leave.