7 Beats a day? That can very much be done in a matter of 11-12 hours with some GREAT quality tracks if you're actually THAT GOOD. Most I've done in a day is 5, all original, completely different sounding, mixed down, etc. Takes some real endurance! Doing more than 8 hours of music work in a day will take a serious toll on your ears.
If he's doing 7 beats a day and 5 out of 7 are simpleton sample kick snare bass hat, he's not doing much work and it shouldn't surprise you that he's doing 7 beats a day. Those don't even take long to mix down and do effects and breakdowns. If I primarily made beats with samples, that would be standard to knock out in a day if I was focused on just making beats. I personally take much longer and do a lot more to each track. As a working producer, if he doesn't have people in the studio on any given day he SHOULD be doing at least 5-6 a day to ensure that he continuously gets his paper.