Permissions are valid for 5 or 10 years, depending on the type of device. The center, if possible, before the approaching expiry date of the permits, sends students reminders about the need to renew them. We must remember, We must remember that in the case of issuing a certificate or a plastic card from the Center, according to separate international ISO standards (in order for the student to apply for recognition in other nations), the validity period of the certificates is from 1 to 3 years. The time is adjusted to the requirements of periodic training in a given nation and depending on the result of checking knowledge and skills, as well as the form of training and several other variables.