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Crocodiles can submerge and remain underwater for a variety of reasons. In most voluntary dives, crocodiles stay underwater for between 10 to 15 minutes. If the crocodile is trying to hide from a threat, dive length may be longer, up to 30 minutes or more.
Most experts agree that dolphins usually stay underwater for anywhere up to 8 minutes, the average being 3-6, however there have been occasions when dolphins have remained submerged for as much as 30 minutes and some reports of hour long dives, however there is little or no evidence to verify these reports.hen they are awake, they need to come up for air every twenty minutes or so. But when they are asleep, they can stay underwater all night long. I really have no idea how th â¦ at's possible; all I know is that my turtle stays asleep underwater all night long (8 to 10 hours).