With Screen Time, you can access real-time reports showing much much time you spend on your device.
Use Screen Time on your iPhone or iPad - Apple Support
How much do you use your iPhone?
Use Screen Time on your iPhone or iPad - Apple Support (GW)
Use Screen Time on your iPhone or iPad - Apple Support (CA)
Find files on your iPhone or iPad in the Files app - Apple Support
If your Apple ID is greyed out in Settings - Apple Support
How much do you use your iPhone?
Jason Speight on LinkedIn: Apple Hongdae now open in South Korea
Use Screen Time to turn off in-app purchases on your iPhone or iPad - Apple Support