Three-year-cruise becomes ‘the cruise that never ends’
https://edition.cnn.com/travel/article/three-year-cruise-never-ends/index.html
$3,500-$4,000 per month won't be so expensive, considering that daily fare is 100 to 140 USD.
But, it must be boring to keep traveling for 3 years. I would like to travel three times a year rather than that.