A life jacket is a very effective tool for staying afloat in any body of water. You may be wondering how long life jackets are effective for once in the water. The answer is, essentially, as long as you may possibly need.
Most search and rescue efforts at sea stop after 3 days, as humans can’t survive more than that without water. A life jacket in working order, though, continues to do its job far longer than that. In fact, life jackets continue to be effective even if the person wearing them has passed.