"not really long..."
Longest yet (by me that is) was from Gander (CYQX) Newfoundland, to Stephenville (CYJT) also in Newfoundland. For a total of 5 hours, with two short fuel stops in Deer Lake (CYDF). total time was 5 hours and 15 minutes, and somebody else mentioned erasing the crack, and I can attest to the thrutfulness of this, particularily in the Schweizer 300CB
But I know there are other great ones!