Meanings of planetary time in English

We have introduced something exponential into the equations of planetary time -and that something is technology.

By checking local planetary time, Geary could see that his message had reached the planet during the night.

If I left Gethen now for the nearest world, Ollul, I'd spend seventeen years of planetary time getting there.

After all, a ship setting out at once from the closest of Winter's new allies could not arrive before seventeen years, planetary time, had passed.