Is this a realistic 7-8 year goal as a REI?

[Craig Moore]

Hi BP,

I'm a new REI (with a focus on buy-and-hold investing) and I'm wondering if this map plan that I have for my future is tangible for:

1) quitting my job BY 30. 

2) Living financially stable.

My plan is to buy 1 multi-family per year up until I reach the age of 30 (this age is subject to change to maybe 32..). That means over the next 7 (or 9) years (age 23 now) I will have accumulated 21 (or 27) units. There are a number of things to factor in that I don't yet know (taxes, mortgage, etc) but the math that I've done seems promising. Please note that I'm just using random numbers.

I was wondering if you all thought this was a tangible idea and something I could live off of comfortably? Let me know!