What are the driving limits in the States for a commercial driver (Big Rig or Greyhound Bus for example)?
I do not recall the exact rules but there is no way a commercial driver in Europe would be allowed on the roads for those sorts of hours without sleep and with such inadequate breaks.
My point is they do not make these rules up for no good reason, whle you may think it is a challenge to do these endurance trips you are hazarding other road users if you do so with a sleep deficit.
If you want to push yourself - try climbing a mountain dressed as a bear or something!! :lol: