Too many BRRR rentals too fast?

[Johnoson Crutchfield]

So I know a lot of the time we focus on the new folks just getting started. But I know someone BRRR investing pretty much a house a month, adding properties like crazy. At first glance, I say that's too many too fast. At the next glance, I saw if it cash flows keep going. Is there such thing as too many too fast when BRRR investing? The typical deal looks something like this from what he says. Do I tell him to keep going or pause?

All in cash and Rehab 60k.

Rents for 800/month

15 year amoritizing notes.

$1500/taxes annually

1200/insurance annually.