It'll be like that 'from now until doomsday'. [=for a very long time; forever]
The book explores a 'doomsday scenario' in which an asteroid hits the Earth.
a 'doomsday machine' [=a machine that will destroy the world]
(..) He beat them to the punch. Get the bank empIoyee fiIes and run down the prints on a guy named Ipkiss. You figure it was an inside job? I need some prints to Iock this whack job up tiII doomsday. grand... to whoever finds that green bastard before the cops. every Iow Iife in this town. Understand? (..)1994 The Mask