I was in a FAS - fully shielded, with boosters
With mirrored armour and full HRP (ie nothing else in the available internals)
My ship was down from full shields to 36% hull in under 15 seconds from a python...
Your shields do nothing
Your armour does nothing
Your HRP do nothing
As I said - I just don't think you've had one of these encounters yet..
Taking damage = time to leave!