Using 40mm tires [which roll fast and are comfy] you'll have no problems covering those distances even on rough pavement on a Tikit. I love mine and ride it as often as possible....
http://thelazyrando.wordpress.com/20...-surface-test/
You can get the Tikit built with the TT length you need for comfortable cycling, gearing for your speed/terrain needs, any bars you need/want.