Dang, MrsP...you're quick with the draw. I most always jackoff casually so I may stop and start several times to draw it out. It's typical for it to take me 15-30 but if I'm really going at it I can be done in 5 minutes.
With my Hello Kitty it's about 3-10 minutes I'd say. If its going to happen it happens quick with that. With water play 10-20 minutes and with plain old lefty anywhere from 5-20 minutes.
I'm about in the same time frame as you!! Somedays really quick and others just a little longer. I guess it depends on how much help I'm getting. Somedays I prefer to have a couple and some days just one.