@Dave VonaI purchased 4 properties with financing in the span of about 10 months and didn't see a significant drop in my credit score.

It is a span tabel from the IRBC. 

If I do not take the cost divided by(expected life span in months) starting at the first month I would need to do something like this later on: cost divided by (expected remaining life span in months). 

It sounds a little weird to do it this way, but when you have a water bill that spans multiple months, and tenants move out/move in over that period, it helps allocate the bill somewhat fairlyUnit 1: 2 tenants (A&B) lived there 15 days then moved out.

Instead of postulating when/why/how a market crash will happen (it inevitably will over a long enough time span), lets discuss the different scenarios and their effects on rent/property values.

Also what could you buy at the same price or slightly higher than has a longer life span etc?

I'm getting different rates for different lenders; spanning from 3.7 all the way up to 4.6. 

Mechanical equipment such as water heaters, dishwashers, garbage disposals, and pool equipment, for example, have estimated life spans.

Mechanical equipment such as water heaters, dishwashers, garbage disposals, and pool equipment, for example, have estimated life spans.

It's also slow to correct, the average price change over a 24 month span in the last recession saw home values drop by -18% (on average, over 24 months), some markets dropped more and some less.