Normal time for E-3D WAD to LSV (Nellis) is 10hrs 50mins direct for RF.
My longest unrefuelled Tornado is 3hrs 05mins and 11hrs-dead on E-3D, although both still had "some" fuel to go. I seem to remember an F3 in the 80s flying transatlantic unrefuelled West to East with 2x 2250l and 2x 1500l tanks ("ferry fit") - don't know how long that was but must be 5-6 hours??!!
Did 10hrs and 5mins in a Tornado with AAR once - very uncomfortable!
iRaven