If you have never done Child Safe Environments training before, it is likely that you will be required to complete the full 7 hour course. From that point, the general consensus is that you are required to complete a ‘refresher’ course every three years.
Though, there is no set legislation on this issue, so be sure to check with you employer on their specific requirements as it can vary. Some employers require a yearly refresher, whereas other just require that you have completed it once.
So check with your employer or volunteer organisation with regarding their Child Safe Environments policy and that will make it clear if you need to do the course, if so which course you need to do, and how often.