There are a couple of things to do before setting play time limits. Please check if you are ready before proceeding to the following steps.
Preparation
Nintendo Switch Parental Controls is a mobile app designed for parents and guardians to monitor their child’s game play. You can manage gameplay time and adjust restrictions based on the games age-rating and communications features.
You can view which games are being played and for how long from the initial screen of the Nintendo Switch Parental Controls mobile app.
This information is updated approximately every 10 minutes, but it may take some time to reflect depending on the status of the Internet connection.
You can also view which games have been played and for how long on a monthly basis by selecting "Monthly Summary".