Can I comfortably retire in 15 years, living off rental cash flow alone, by, every year for 15 years, putting 20% - 25% down on 1 run-of-the mill turnkey property at retail in a stable market (say, Indy) and re-investing all cash flow?

[Logan Allec]

This seems like an extremely conservative strategy for someone my age (I'm 26), but all I really care about is being able to retire comfortably and early in my early 40s.  I know nothing is guaranteed, but does this conservative strategy have a probable chance at attaining the desired outcome?

Moving away from hypotheticals, has anyone out there actually employed this conservative strategy and been able to retire within 15 years of purchasing their first property?  HAS ANYONE DONE IT?  Would love to chat with you!

And speaking more analytically, does anyone have a SPREADSHEET that puts such a plan in action (at least in Excel), making reasonable assumptions, to prove that the numbers would work?