Between 8 and 9 hours most of the time but with variations.
That's like me right now, depending on the bed I'm sleeping in as well. If it's at my mum's in the foldout bed, sleep is difficult to get....it's not the best anyway. But if it's at my grandparents....8 hours of sleep straight easily for sure, give or take waking up at least once throughout the night, but then falling asleep again.
But for me, 8 hours of sleep is the best anyway, between 8 and 9 hours of sleep anyway. And it's weird too, anymore than that and I can't really sleep properly anymore, as in, sort of sleeping, but in reality, I would just be trying to sleep some more when I can't.
So example, I go to bed at say, 9:30pm, I tend to wake up, without an alarm, at around 7am myself....6am for my job, which gives me at least the 8 hours worth of sleep, minimum.