I can do is fast sketches for an idea of characters or a list of ideas and make about 5-8 ideas.
*Recommended color pallets and ideas first.
*Good communication with my worker and making sure they give a full detail if the idea needs to be changed.
*small ideas take about a day or two
*large ideas might take more than a week
*mostly detailed ideas will take a while too
*respect towards me would make the process faster