The eating intervals are far greater apart than 19 seconds. I was chasing a 145 dolphin around for 15 minutes constantly checking to feed it or not. When it did eat it felt more like 1 to 2 minutes or three before it would eat again. Highly recommended you eat some focal chili and then swim after it with flippers. Even with a base oxygen and 100 and movement speed of 100 you'll still be able to out swim it.

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