Your usage is normal, there's nothing wrong with it. No device will last 20 hours continuously with heavy use.
This is just the device's estimated battery life based on your usage, so don't rely on it because your actual usage can vary. It's normal usage, there's nothing to worry about.
Actually, 20 hours of estimated battery life is quite good for daily use. This estimate changes based on your recent activity. If you want to improve it, try checking 'Battery transition' in settings to see which apps are consuming power, and make sure to enable 'Adaptive Battery' to optimize performance."
