Rotafix - how tight?
 

How hard am I supposed to rotate the wheel when I'm using the Rotafix method of tightening a cog?

I don't need to Rotafix since I use a lockring, but I was wondering in case I ever needed to use it.

Also, I'm not interested in whether or not you think a chain whip is better than Rotafixing.

That depends if you want to take your cog off or not.

Harder than me

...Threshold of crushing the BB shell.

the first time I went so far as to snap my chain. don't snap your chain