Is there time limit to restore char from character restoration service ?

Hello guys I played on Icecrown realm, but deleted my characters about 3-4 months ago.

I recall that I was able to restore them for 10 points or coins per char deleted, but now when I choose the service option "Character Restoration" it doesen't show any characacters to restore.
Does this mean, that there is no possible way to restore my characters ?

yes there is a limit, it should be 30 days if I remember correctly

Yes, characters are kept available for restoration for 30 days, and then gone.