What's interesting here is that most of our fastest man-made things are around TD:2 - from the Bugatti Veyron to the SR-71 Blackbird. Most of our regular movement in everyday life is around TD:-1 to TD:1. Once you move up to TD:4 you're in escape velocity territory. Then it's all orbital velocity, elementary particles and light transmission up to TD:8, where you hit the speed of light (at TD:8.476820703 or thereabouts).
From there it's all conjecture. A lightyear per second, an idea I explore elsewhere, is actually around TD:15 - a colossal speed but even then painfully slow for exploring the universe. At TD:15 it still takes nearly three weeks to get to Andromeda, the nearest large galaxy. Upping the speed to TD:20 makes that journey into three minutes, but still the far reaches of the galaxy will take years or decades.
Bring it on, I say.
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