I keep mine and just put into storage (incase the ICO are reading, it is a 20inch thick steel vault, wrapped in chains and barbed wire, which has been dropped to the bottom of a tank of acid and is guarded by acid proof sharks with lasers on their heads). Think it is 5-6 years just in case you are sued. However I believe if the person who is suing you was under 18 at the time of any incident has 5-6 years after their 18th birthday, not from the date of the incident to sue.