I went from a chieftan to a jet and got signed off on line training in the min 20 sectors. Sometimes it's the company calls and procedures that take a little more time. Speed of a jet, well it's basic maths to plan time against speed and altitude. But even now I fly with those who rely on vnav tod or just descend at a higher rate to always be below the optimum. I just think some people are lazy and that is where a cadet is strong. They are financed to the hilt and can't afford to f up.