It depends...
I have a full-time job, with an hour commute, so during the week, it's not much. It chould be an hour, it could be three hours, it could be none. Depends on my mood, how tired I am, and so on.
On the weekends, it depends entirely on what we have going on. Last weekend, I went on a house-cleaning binge, and didn't get much quilting done at all. Next weekend, we will be traveling across the state to spend time with the grandbabies.
Every other month, I travel 2 hours to my longarm guild meeting that lasts several hours. So, that's takes about 8 hours of that day, but I usually come home really inspired, so end up spending at least a couple hours more quilting on those days.
We have a small farm, so this can all vary at any given time - horses, chickens, garden, etc, all need to be dealt with every day.
But, it's my creative and emotional outlet. It's not a job (although I do make a little money with my longarm work) so I quilt when I feel like it and have time.