Turning Over Multifamily Units - What is the standard?

[Dan Handford]

I was shopping an apartment for a syndicated investment this past week and was drilling the property managers on various topics.

One of the topics that I have been getting a wide variety of answers is when I ask the question of how fast they turn over units. 

I had one multifamily (261 units) PM tell me they turn over units and have them rent ready in 3 days. 

Another apartment PM (346 units) told me it took them 2 weeks.

Then I had another PM (178 units) say it took them "about a week".

What is the standard or "norm", if there is one for this type of turn over?

Any thoughts or input here?