Eternity

Eternity referred to something being never-ending in time, whereas infinity referred to never-ending space.

The Daleks operating the first Dalek time machine were ordered to pursue the First Doctor and his companions through all eternity. (TV: The Chase)

The Fourth Doctor told Sarah Jane Smith that he walked in eternity. (TV: Pyramids of Mars)

In the Brothers Grimm tale of the Shepherd's Boy, he is asked by the Emperor "how many seconds in eternity?" (TV: Heaven Sent)