Is training awareness required for HR Managers on latest skills, concepts, developments in HR? If so, how often - every 2 years, 5 years or 10 years?

Yes, sure. Trainings play an essential part of organization growth because people acquire new skills that helps organization's ability to execute business efficiently. Trainings are important for every department, whether it's HR or Finance or Sales.. Why wait until1 year to conduct trainings? Organize training sessions whenever there is something new for others to learn, whenever there is some lesson learnt from past instances, or when there is new skill, technology, or process is identified...

Training is required to get the latest knowledge, skills, methods and up dated with the latest trends. It is better after every2 years. This training must include the latest technology usage which impacts the performance of HR department.

02 years ok. I would say every year need at least40-50 hours training for HR Manager on HR issue.