Windows
General
- Start menu > Settings > System > Notifications
- Scroll down to Notifications from apps
- Click on Google Chrome for more notification settings
Duration in seconds
- Start menu > Settings > Accessibility > Visual Effects > Dismiss notifications after this amount
of time (default is 5s)
Mac
- Maximum system duration is 5s
- System preferences > Notifications > Google Chrome
- (Optional) To set notification to never disappear, select Alerts (instead of Banners)