There is no meaning in making a decryption key based on days, as we cannot speed up instead finding a loop inside xenforo2. Is that what your intention is? If genuine why not considering any real members who are less than 60d? Rules and made for Good. Not for making inconveninece to people who trust the platform.
Your idea never made any good than finding a competant forum from www.
Thank You. Hope you will see the light now.