From the intersection of the 4 and the turn to Koh Lanta............... to Trang, how long timewise is the trip?

I already know the distance, just need to know if I cover that at 110 on decent straightaway, or if that's at an average of 70, stuck behind trucks on a curvy two way.

Anyone who has done the trip, info is appreciated.

Drove down that way a few months ago. Can't remember how long from that turn-off, but it took much longer than I expected from looking at the map. Mostly a 2 way, some straights, quite a few trucks. Not a 110 steady road. Assume 90 best average.