I get an hour per week whilst DH takes DS to swimming lessons.
Maybe once every month or two I might get a bit more, like Saturday just gone I went to the craft fair for a few hours, it was great to walk around at my own leisure and not have to worry about keeping DS occupied!
And I go out for dinner with friends every 4-5 months too
Apart from that it's grab a bit of time whilst DS is sleeping, although yesterday I'd just settled in to do some of my cross stitch and DS decided he'd only have a 1/2 hour sleep for the whole day! Lovely!