Both sisters are retired and single and have collectively spent 1,500 days at sea so far. Each already booked their spots on 2025 Holland America Line cruises that are over 100 days long. "I kept taking cruises of longer lengths — 30 days, then 45, then 80, and learned I liked long stretches at sea," Johnston told Business Insider. Although the sisters don't always travel together, they've collectively spent over 1,500 days at sea — many of them on Holland America Line ships. Without all of that, I have a lot more money to spend on travel," Johnston told BI.

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Persons: Jo Johnston, Elaine Durham, —, Johnston, they've, They've, — Johnston, wouldn't, Durham, would've, she's, — they've, I've Organizations: America Line, Service, Business, Holland America, Holland America Line's, BI Locations: America, Holland, Durham, Barcelona, Europe, Canada, New England