A couple summers ago, we drove from Moncton, N.B., to home in Toronto, 1500km, in 16 hours. I believe that's my longest straight through drive ever.
Last summer we drove over 16,000km in less than 5 weeks, from Toronto to Vancouver Island to Inuvik and back.
This summer its going to be Alice Springs, to Uluru, to Kakadu, to Cairns in Australia. About 5,500km, in about 2 weeks.