This membership is for a one-month license key for the BDO Speeder, which can be resold or used on your own account. License keys expire after three months if they are not used. Other than this limitation, the expiration date of the license will not be set until the key is actually used. Thus, as long as you use or resell the license key within three months, you will not lose any time.
Once used to log in or register, the license will expire after one month. You will receive an email when this happens.
You may merge licenses together to extend the expiration date. For example, merging three licenses together would give you a single license with a three-month duration. This allows you to extend a customer's license without having to wait for it to expire.