I will be doing two carves, each are 6hrs at *best* setting or 11hrs at the *optimum* setting. One carve is the open book on 1 inch cherry with only some writing, while the other is *the old world or atlas*, 1" cherry. The board size is 14" x 24" for each. Will there be that much of a difference in the carve for the extra time it takes?. Thank you.