How long was deinosuchus?

Answer 1

Based on what palaeontologists found on the fossils of these great ancient alligators, it's estimated the deinosuchus may have reached around 10 meters (or around 33 feet) in length. The fact that these prehistoric gators may have grown to much longer lengths (such as 12 or even past 15 metres) is unfounded due to lack of adequate fossil evidence.

Answer 2

83 to 72 million years ago. Some will say it survived untill 64 million years ago, so the extended version is 83 to 64 million years ago. However, the generally accepted answer would be 83-72 million years ago.