This last February I took a handful of streaming commissions. I had wanted to do these every day, but just couldn’t keep up. (I had other artistic obligation that restrained me)
Each one of these took me precisely 2 hours. I enjoyed the hell out of them too. I use a Render Brush in Painter 12, it has hard smooth edges, and just feels like sex rolling onto the image. It let’s me go from doing broad thick strokes, to tiny hairline details without having to mess around too much with the brush size.