Once common throughout much of western North America, the grizzly bear species currently reside in five separate populations in western Canada, Alaska, Wyoming, Montana, Idaho and Washington; and there are around 30,000 bears in Alaska.
A rebound can last forever or a week. It completely depends. If you are already looking at the relationship as a rebound then it should end soon. You will not last with a person you feel is nothing more than a rebound to you.
Istat dives into these numbers a little deeper, noting that the average marriage lasts 15 years up until separation or 18 up until divorce. Regardless of how long couples stay together, marriage, as an institution, has fallen out of favor with couples. As of 2010, separation and divorce rates grew.