It took two million years for some of the radioactive clouds to allow some sun in.
6 seconds sound clip from the Wizards (1977) movie soundboard.
You can hear this line at 00:01:36.355 in the Blu-ray version of the movie.
Quote context
[...]
- The world blew up in a thousand atomic fireballs. The first blast was set off by five terrorists.
- It took two million years for some of the radioactive clouds to allow some sun in.
- By then, only a handful of humans survived.
- The rest of humanity had changed into hideous mutants.
- They lived happily in the good areas.
[...]