How many hours? Far too many.
I'd actually be a bit scared to work it out. Most of my favourite activities are sedentary - reading, writing, jigsaws, films, quizzes eating, drinking, watching telly, surfing the net. I'm not a gardener and I'm certainly not a good housewife, so if I stayed in the stats would be shameful. I have a MiFit (the cheapo version of the Fitbit), and it motivates me to get out and walk at least 8,000 steps a day. I do yogalates three times a week, but I'm mainly on my bum for that.
I used to run and am thinking of taking it up again, though it wasn't kind on my back. I think my saving grace at the moment is looking after the grandsons - we do two very long days a week at least and only get to sit down for story time. Thank goodness they love their books!