I think 20 days is unreasonable and unlikely the law.

It is a hurdle I am currently facing and would be a great help! 

Where I have seen it fail is putting lipstick on a pig then attempting to sell it at an unreasonable price. 

It just adds a hurdle that with the right approach you can maneuver around it and prepare for it.

With 2-4 units, if you don't have a huge portfolio or if you have a good PM it isn't unreasonable to have a tenant lined up to move in the day after your existing tenant moves out.PM: Instead of using a market standard like 10%, I'd get with a PM company and have them estimate a property that is similar to what you are looking to buy.

@Boris Lee - Your first hurdle will be financing.  30 year fixed conventional loans are not available if you use an entity. 

If you know how to operate in them, they are actually fair.  10% per year is not an unreasonable amount of rental increase without having to pay fees or relocation costs.

I have zero retirement savings and am eager to start building a passive-income portfolio so I am not a burden to my child.One of my biggest hurdles is that I need to boost my income so that in the bank's eyes I can afford the mortgage payment BEFORE collecting any rent.

Both the LP and the GP enjoy profit sharing and the LPs benefit because they get paid first and the GP only makes a profit if the LP clears their hurdle.

@Jessica HuynhWith FHA, you also have the ‘self sufficiency test’ for 3 & 4 plexes which is an additional hurdle that most can’t get over in higher priced markets.75% of the entire rental income must cover PITI, which is why a lot of multiplexes don’t qualify for FHA loans without a bigger down payment.The only way to get 10% down programs will be with local credit unions and community banks that offer portfolio/ ‘in house’ loans for owner-occupied plexes.