1) Butter servings 2) Continues on 3) Displays stamina 4) Endures 5) Endures to final second 6) Endures to the end 7) Goes nine innings 8) Goes on 9) Goes on and on 10) Goes on and on and 11) Goes the distance 12) Goes the route 13) Hangs in 14) Hangs in there 15) Hangs tough 16) Has a long shelf life 1) Endures