In a comment, I wrote:
Absolutely 0ms isn't possible with any circuit.
Here, in a question, you can see a slight difference between the zero and the o: 0o. But in a comment you can't: 0-10 second on-time with a potentiometer
Can we please have a font that shows the difference between o and 0 in both questions/answers and comments? It's very important for our users, I believe.
I've read this old answer on meta that states the same. You can see there that this can be workarounded with either \$\LaTeX\$ or
code digits, but I'd say that's overkill for simple things like "0ms".