Clarification on BRRRR!

[Joey Walker]

Learning the BRRRR strategy and am trying to figure out how to account for the initial time that is being spent on renovations after purchase that could take multiple months to complete and paying the mortgage without a tenant. Should 3-5 months of the mortgage be saved before the project for that initial vacancy? I don't see an option for that in the calculator. What's the general rule of thumb on this particular temporary expense?