Discworld - A day at the races
Thanatoseraph did this in the past, but I feel a need to redo it with some more info added.
In an instant, Death travelled 300,000,000 lightyears. Let's look at Thief of Time and some other Discworld works to understand what instant means in the context of Discworld.
This is further referenced in Unseen Academicals, and confirmed in Secrets of the Wee Free Men: The Myths and Folklore of Terry Pratchett.
On top of that, we have this reference from The Science of Discworld III: Darwin's Watch of infinite universes being created from the smallest possible instant each instant.
So instance in reference to Discworld (as we are shown & told multiple times) refers to the planck instance. A planck instance is 1e-43 of a second. 300,000,000 lightyears is equal to 2.838219142e+21km.
T = 2.838219142e+21km/1e-43 seconds
= 9.46727999e58 C
Blinky travels across space = 9.46727999e58 C
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