EDIT (12th of July, 2021): The previous change to the Mystic Vision cooldown time has now been reverted back to 8 hours. Please note that the drop rates from Mystic Vision have not been changed.
We will be testing a shorter cooldown for Mystic Vision. This change will start on Friday 4th of June, 2021 at 8 AM UTC, and is scheduled to end on Monday July 12th, 2021 at 8 AM UTC. The cooldown time will be reduced from 8 hours to 4 hours. Do note that during this temporary change the drop rates from Mystic Vision have not been changed.