You have the option to control session lengths from the Magic Dashboard!
Default sessions
This will allow users to remain authenticated with Magic for up to 7 days (or until they logout or browser data is cleared).
Auto Refresh
Enabling Auto Refresh sessions will allow users to stay authenticated with Magic for a duration of your choosing, up to 90 days (or until they logout or browser data is cleared)
More information can be found in our Custom Session Management documentation.