I disagree. Take House Chores or SQ for instance - I guess the time depends on the whole team, but also on subscriptions system and stuff
1st Scarlett Ann is known to be one of the slowest artists open for comission
2nd she works on several projects at the same time
3rd she is only the lead artist... there are other people copying her style to actually make faster releases.
Take a look at Prince of Suborbia or a Zombie's life... both games soley worked with Scarlett Ann for art and both Devs mentioned that they had to wait several month at times for the comisioned art to be ready.
Her Style is good and those balloon tits have a major fan base... but in regard to professionalism and a tight schedule Scarlett Ann is not your best choice