We have been told several times that for an observer any object will seem to move slower and slower the closer it comes the event horizon. In the end, it will seem as if it is standing completely still.

But I assume we are just talking about the information available for us. After all, it would be impossible for a black hole to grow in size if objects never crossed the event horizon.

So even if it looks like an object has stopped moving for an outside observer, how much time will actually have passed outside the black hole’s gravity field when an object has finally crossed the event horizon?