I was always taught that 30 mA was the limit for humans and that it corresponded to 30/40 volts which is also considered the safety voltage.
That would correspond to 1000 ohms, which would be incredibly low for a human body.
30/40 volts is probably too low to even feel, it certainly doesn't pass 30mA through a body
But here is no 'limit', different people react in completely differnt ways.
And I'll ask again - how many people have died from electrocution in the house? - you seem panicked that not having a 30mA (or whatever) RCD means you're going to be killed at any monent