system
Given the following post, respond as if you're commenting on Reddit:
human
[Discworld] How many years have passed since the first book?

Discworld is in the midst of an industrial and cultural revoloution. But how many years had passed between the Colour of Magic and the latest book about steam engines (can't remember the name)?
gpt
The timeline was destroyed and haphazardly stitched together following the events of Thief of Time. Things are so messy that in some places "how much time" is not a meaningful question. Therefore, there is, and can be, no official answer. 

Everyone involved has aged by at least one year and no less than five hundred years.