Perhaps indefinitely.

On Hold Comment
Azumanga Daioh (TV) No real point in continuing this to the end.
Hellsing (TV) I think I may have obtained everything I need to from this series, but may finish it if my interest picks up.
Lucky Star (TV) No real point in continuing this to the end.
(The) Melancholy of Haruhi Suzumiya (TV) As above.
Planetes (TV) Character designs and general setting of the show not so much to my tastes- to see the characters and plot develop isn't a high priority of mine.
School Rumble (TV) No real point in continuing this to the end.