For me, short of apocalypse, I could hold all of my properties indefinitely if I lost all income from the properties because my total number of income streams and diversity of streams can absorb the costs of the properties and my living expenses.

But, from what I am reading my sense is that you are interested in traveling indefinitely, and want a stable (sustainable) lifestyle during that time, but your current intention is to eventually return home.  

It's not ready, the yard is a mess, and the landlord is telling you he'll be around indefinitely making noise and climbing around in your yard working on landscaping.  

Real estate lets you use the 1031 and defer all the tax and depreciation recapture indefinitely.

Unless someone can keep that "Ponzy" stream of out-state capital flowing indefinitely. 

I plan to be consistent, I've set a budget that I can run indefinitely and will put money from successful deals right back into the "business" including upping the level of marketing if I need to generate more leads.This seems to be what the successful guys are doing, consistency and snowballing profits.

I seriously considered investing in TKs, but realized that buying at a premium price meant that I was paying for (or buying) the home’s appreciation for an indefinite period of time.

It sounds like your goal is to use your HELOC's short-term but to not be stuck with those monthly payments into the indefinite future.

I plan on keeping it indefinitely .

I am absolutely astonished with the amount of people who insist that prices are going to rise indefinitely despite all the signs we're seeing.