What is this?

On my screen time widget it keeps increasing (yesterday it got to 700h) I dont understand whats that, i have a mac mini and a macbook who mainly stay on sleep mode. Other than that it's only my phone and when i click to enter the settings app, it shows me only the time i actually spent on my phone.

On my screen time widget it keeps increasing (yesterday it got to 700h) I dont understand whats that, i have a mac mini and a macbook who mainly stay on sleep mode. Other than that it's only my phone and when i click to enter the settings app, it shows me only the time i actually spent on my phone.