"How long is a cruise from San Diego to Hawaii" functions as a question. It inquires about the duration of a sea voyage between two specific locations: San Diego, California, and the Hawaiian Islands.
Determining the length of such a cruise holds relevance for prospective travelers planning their itinerary. A cruise offers a unique blend of transportation, accommodation, and entertainment, allowing individuals to experience multiple destinations while enjoying onboard amenities. Historically, sea voyages have served as a vital mode of travel, connecting distant lands and facilitating exploration.