Arcane Alarm

As an action, you may speak aloud or mentally deice a number of hours, minutes, or seconds equal to no more than 24 hours. After the specified amount of time has passed, you hear a loud ringing that is audible to you and any targets you choose when this ringing begins. You can mentally end a timer at any time using a bonus action.

Higher Level: The time limit increases by 24 hours when you reach levels 5 (48 hours), 11 (72 hours), and finally 17, where there is no time limit.