All the time needed was taken to get my color to my desired color. The student & instructors listed to my desired outcome (hair was too dark & had no highlights the last visit). With a change in the number color - 7 to 8 -, some ingredient changes and no foil but just the roots colored, my hair color came out just as i desired, Lighter with the look of sun kissed. My hair looked like it was when I came in, except no grey roots! Thanks to everyone.