Hours Stayed

1 "He stayed for a few hours."
2 "He stayed a few hours."

3 "For a few hours he stayed."
4 "A few hours he stayed."

5 "The extra hours stayed caused some delay."

Could 5 be
a correct because of the inherent transitiveness of "stay"
b correct because of the acquired transitiveness of "stay" due to special context
c incorrect

?