I think most of you think that speed limit on Salt Range is 50kms, but its not.
LTV= 70kms, pause the vdo at 0:29.
HTV= 50kms 
If you travel within speed limits it takes less then 10 mins to cross the range 
This is the vdo i captured.
//youtu.be/http://www.youtube.com/watch?v=RAG82mH_aSE