This timeframe of four to five years might include the journey he took with detours.
According to the intelligence from the Sky Ruin Hall, to travel to the oceanic territories from the Big Moon Prefecture, one would have to pass through over a dozen Immortal Mansions, including dangerous places like the Nine-Soul Demon Ridge and others that were even more perilous.
Avoiding these hazardous zones and potential troubles encountered along the way, indeed, four to five years was a reasonable estimate.
"The nearby sea area, closest to us, is named the Cover Mountain Sea Region. This name supposedly stems from ancient records, where the most powerful Sea Clan Spirit Beast in the vicinity was referred to as the Cover Sea Xuangui Clan."
Seeing this piece of information, Su Yu was startled.