I've done Austin to Mesa in 23 hours on my Versys.
Make sure you don't do west TX at nite. The deer seem to be everywhere!
Gas is hard to find at nite too.
Have a safe trip. Jim
'13 Honda CRF250L '12 Kawasaki Versys '08 Kawasaki Versys
'06 Kawasaki KLX250 '02 Suzuki DR200SE