Computer Configuration > Administrative Templates > Microsoft Edge > Sleeping tabs settings
Both
HKLM\Software\Policies\Microsoft\Edge
This policy setting lets you configure the timeout, in seconds, after which inactive background tabs will be automatically put to sleep if sleeping tabs is enabled. By default, this timeout is 7,200 seconds (2 hours). Tabs are only put to sleep automatically when the policy 'SleepingTabsEnabled' (Configure sleeping tabs) is enabled or is not configured and the user has enabled the sleeping tabs setting. If you don't configure this policy, users can choose the timeout value. Policy options mapping: * 30Seconds (30) = 30 seconds of inactivity * 5Minutes (300) = 5 minutes of inactivity * 15Minutes (900) = 15 minutes of inactivity * 30Minutes (1800) = 30 minutes of inactivity * 1Hour (3600) = 1 hour of inactivity * 2Hours (7200) = 2 hours of inactivity * 3Hours (10800) = 3 hours of inactivity * 6Hours (21600) = 6 hours of inactivity * 12Hours (43200) = 12 hours of inactivity Use the preceding information when configuring this policy.