AFTER TAXIING ONTO RWY; LGT REFUSED TKOF CLRNC DUE TO WAKE TURBULENCE FROM HVT THAT JUST DEPARTED. WAS TOLD BY TWR TO CLEAR THE RWY.

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WE REFUSED TO TKOF IN OUR LGT X IMMEDIATELY BEHIND A HVT Y AS NOT ENOUGH TIME HAD ELAPSED AND WE COULD STILL SEE TIGHT VORTICES FORMED IN THE HEAVY; DARK JET EXHAUST AT HIS ROTATION POINT. WE HAD A SLIGHT TAILWIND AND A LARGE TEMP/DEW POINT SPREAD (50 DEGS); 66 DEGS/16 DEGS; ALSO HIGH CLOUDS. WE WERE HEAVY FOR AN LGT ALSO. SO; ALL CONDITIONS WERE SET UP FOR A DIFFICULT TKOF AT BEST (NOT MENTIONING ANY ENG FAILURE). SO; THERE WAS NO DOUBT IN THE MINDS OF ALL 3 OF US THAT WE NEEDED TO WAIT AT LEAST ANOTHER MINUTE AND WATCH THE VORTICES DISSIPATE BEFORE TAKING OFF; WHICH IS WHAT WE DID. SO; WHAT'S THE PROB; YOU ASK? DEN TWR SAID; 'GO NOW OR CLR THE RWY;' AFTER WE TOLD THEM THE PROB. WE TAXIED CLR AND WAITED FOR ABOUT 11 MINS WHILE SEVERAL ACFT TOOK OFF AHEAD OF US. WE COULD HAVE TAKEN OFF BEFORE THE FIRST ONE NEXT BEHIND US TOOK OFF IF WE HAD BEEN ALLOWED TO WAIT ABOUT 1 MIN. THE PROB IS: THIS IS STRONG PRESSURE BROUGHT TO BEAR ON THE FIRST ONE TO GO AFTER A HVY. THE NEXT ONE AFTER THE FIRST HAS CLRED HAS NO PROB DUE TO THE TIME THAT HAS GONE BY.