system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How quickly do microorganisms move around?

Lets say I have this 10x10 rectangle in my living room floor. I use bleach and hypothetical chemicals that will completely kill any microorganism in this rectangle, BUT the rest of the living room is a regular microbe infested floor. 

Lets also say, that while it would be pretty impossible to do, that there is no dust or anything in the air that would eventually land on this absolutely clean floor. How long would it take for all the microorganisms to eventually move into the space? Do they even move any significant amount at all? Do they have reason to move at all? Are microrganisms "moving" just them multiplying and spreading?
gpt
Bacteria can reach speeds from 2 microns per second (Beggiatoa, a gliding bacteria) to 200 microns per second (Vibrio comma, polar bacteria). Speed varies with type of bacteria, but flagellates are undoubtedly faster than gliders.