If you are buying a car for long route driving pleasure "2 trips mn he shoq pora ho jay ga". Unfortunately our roads are death traps and driving on these roads put you and your family at risk, so I suggest you buy a reasonable car for intercity drive and travel via Daewoo / pia for Sgd or Lahore.
As far as long distance travelling is concern there is no limit for car or driver (if 2 drivers are available) the only limiting factor is better half and kids. You would be forced to do a night stop close to Multan.
