How far did the friends have to carry the paralytic man in Luke 5?

In Luke 5, the friends carried the paralytic man from a place where they could not enter due to the crowd to the roof of the house where Jesus was teaching. After making an opening in the roof, they lowered the man down on his mat directly in front of Jesus. The exact distance they carried him is not specified in the text, but it is implied that they went through considerable effort to bring him to Jesus.