The **tenure** of Software Engineers in Seattle, WA is about two years.

From the [Free Dictionary][1]:

> tenure (*n.*): 

>1.a The act, fact, manner, or condition of holding something in one's possession, as real estate or an office; occupation.
1.b A period during which something is held.

>2. The status of holding one's position on a permanent basis without periodic contract renewals: *a teacher granted tenure on a faculty*. 

While the most common assocation for many people is that of definition 2., in university settings, it is the widely acceptable with the first definition, as in your sentence.


  [1]: http://www.thefreedictionary.com/tenure