Generally, modern smartphones can have a screen-on time ranging from a few hours to a full day on a single charge, depending on usage patterns.
You can check it as follows:
realme UI 2.0 & above versions: Settings > Battery > Battery usage > Screen on since last charge.
realme UI R & T & U Edition: Settings > Battery > Battery usage > Screen time since last full charge.
realme UI S & Go Edition: Not supported
