If you use it beyond occasional, check with your Grandson what sort of account you are on and when the account was created.
I don't know the current constraints but it used to be free uners can listen without limit as to how long but once the account was 6 months after being opened the account would be limited to 10 hrs per month.
Undoubtedly changed these days but they will be wanting to push free users into paid for users.
