I often get 8 hours however currently I am transferring to a new Op Shop about to open in Perth and am waking in the night at all hours, thinking of things I have to do and get and ask about.
So, NO I do not get the same amount each night as sometimes now I am awake for an hour or two at a time!
Also at other times in my life, I have woken and not got back to sleep for an hour or so.
I do generally however, have a total of 7 to 8 hours and seem to wake at the same time every morning.