Contenders:
1) A 3 month, 5 day odyssey (road trip) from West Palm Beach to San Diego (via Kentucky, WV, Santa Fe), then up to Palm Springs/LA, then CA 1 to SF/Sonoma, then Portland. After that, I drove to Port Angeles WA to catch a ferry to Victoria BC, from whence I then followed the Trans-Canada to Quebec City stopping at every major city/town en route, before coming down to Vermont and finishing in DC after a stop in NYC. I hesitate to call it a holiday.
2) A more conventional 6 week trip around Australia, then Hong Kong, then Bali.
After both, I found it appealing to eat a home cooked meal and sleep in my own bed.