Disabling Cross Save incurs a 90-day lockout before you enable cross save again. Silver purchases start the lockout over, as well. There are no exceptions to the 90-day lockout. This is covered on the Cross Save landing page: https://www.bungie.net/7/en/CrossSave As well as the Cross Save Help page: https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide