In our experience, things move in ebbs and flows and the speed of rental depends on your asking rents relative to competition.For example, there was a period of several months at one of our properties when a 3 or 4 BR unit came on the market it rented almost instantly. 

An analysis of the data also shows that the city north of Austin grew 10.6% year-over-year, making it the fastest-growing city of at least 50,000 people.

Quote from @Lionel Quiambao:  ... and maybe throw in the option for the tenant for more speed at an increased rent to cover the additional payment. 

The fastest I've seen personally is a few days, with a reinsurance policy through Metro Title (they were on Glenwood Ave in Raleigh, but I think they moved.)

Speed, speed, speed.

Fastest way to scale. 

I have been to the DFW area a few times but not specifically to these northern suburbs, but I know that DFW is one of the fastest growing metro areas in the country with a robust economy, and I expect it to keep growing.

Speed of building a portfolio (Cash-on-Cash return is a factor here)?

Do you want cheap, regardless of speed and communication? 

We also have programs that can close in 3 days or less if you need speed.