Question:
until they got off the machine

Does it follow that "Until they will leave."?
Answer:
yes

Question:
But the old dog's been at it going on 25 years.

Does it follow that "For 25 years there has been an old dog doing it."?
Answer:
yes

Question:
how are rents doing i haven't looked at rents in a long time

Does it follow that "How is the rent there? "?
Answer:
yes

Question:
No one knows for certain when the figure was carved; one legend dates it to the early 8th century.

Does it follow that "The figure was actually carved in the 9th century."?
Answer:
it is not possible to tell