That changes pretty drastically with application size and age. My project at work is at least eight years old and pretty damn huge. It uses a considerable set o

That changes pretty drastically with application size and age. My project at work is at least eight years old and pretty damn huge. It uses a considerable set of libraries, some of which are close to abandoned. Others we've hacked up to the point that we're basically maintaining our own fork. Version upgrades in that setup are not simple. Mostly because verifying correctness here scales with the interaction of changed features, which tends to grow much faster than pure application size.