Unfortunately, I can't give an exact figure (perhaps someone else can?). But in my experience, the battery level is around 50% in the evening with moderate use. With complete standby, that should easily be enough for 2 days, or more. Perhaps there are more precise tests on the web, although they rarely test standby use.

For me, the battery lasts at least 36 hours with a charge level of 90%. But I have to say that I don't play games on my smartphone. I chat quite often, talk on the phone for about 30 minutes a day and occasionally read the news or watch videos.