I don't think that can be topped. There aren't any more roads in Alaska.
edit:
Maybe...
In the meantime, I found a respectable one from Norway. Tromso to Kristiansand - 1,970 km, 29 hours. Could be longer, but any farther northeast and Google starts routing you through Sweden.
edit:
Looking at satellite photos it seems Google Maps is missing a lot of the roads in Alaska, so you can probably do better.
Maybe...
In the meantime, I found a respectable one from Norway. Tromso to Kristiansand - 1,970 km, 29 hours. Could be longer, but any farther northeast and Google starts routing you through Sweden.
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