<prompt> Human: My fifth purchase has now brought my real estate holdings to over 1m. Four properties have mortgages. When the total value doubles at some point in my life, I will have achieved 1m gain in equity. Will this be in 10 years? 15? 20 or more?  <response>: Im thinking 6 years and 47 days, the 6th property is the one thats going to be the game changer 