So this Kurzgesagt video talks about quark stars, and how two of them colliding could send strangelets flying towards Earth or the Sun. Now it's been said that since, theoretically (as none has been actually observed), this is a more stable state of matter, this could start a "contamination" of sorts that turns any celestial body into a ball of strange matter (essentially, a new quark star). There are articles discussing these possibilities (along with other things such as the true vacuum theory) and there have been books with the plot being that a particle accelerator created strange matter that escapes (which, from my understanding, is highly unlikely).
Now let's imagine that such a collision happens and a droplet of strange matter is sent towards the Earth. Somehow, we assume it is negatively charged and it hits the ground somewhere, while being only the size – at most – of a tennis ball (and possibly much smaller).
How fast would the conversion of matter on Earth to strange matter take? This may be explained in the articles but my lack of advanced understanding of physics and my gut reaction to equations more advanced than quadratics means the more scientific articles seem like a foreign language to me and I have not found this answered anywhere else. Would this wave be noticeable? It is regularly described as fire eating through a forest, but would it move at a similar rate? Or would it be instantaneous like the true vacuum bubble expanding that spreads at the speed of light?
Could it have a similar effect to the mysterious wave that sweeps through the Earth in the 2nd Law: Isolated System video by Muse? (while not visually looking anything like it once it's turned matter to strange matter, I'm talking about a wave that you could outrun if you had enough stamina… until you run out of planet that is).