Just came across Regent's 2025 WC. It's 150 days, but doesn't go around the world. It goes from Miami south to S. America and around Cape Horne and then on to New Zealand, Australia, Indonesia and north, then over to Alaska and back.
https://www.cruisespecialists.com/cruise-promotion-detail.aspx?packageId=131352
I would love to visit all those places, but my bucket list is around the globe, so this one will not be for us. Anyone else feel the same about Around the World cruises? :)