When does the BRRRR start to pay off?

[Steve Rich]

Good evening all. Please forgive my ignorance. I've only just discovered Bigger Pockets and the brrrr strategy within the last couple of days. I don't even know if there's a search function.  My question is this. When do these properties begin to make a noticeable pay off? Let's say you brrrr your way to five properties for example. If you're cash flowing $200 on each, there's a $1,000 that you're probably saving to bolster your emergency fund for these properties. Are you mostly only benefiting once these house are owned outright and you're banking nearly the full rent amounts? 

Thanks in advance for any guidance you may have to offer.