Training Schedule for Future GMs

“It should also be mentioned that chess players under 7 years old, should not follow this routine because they typically have their own sleeping and eating cycles. Chess players from 7-14 years old, should shorten this training session by 50-60%. Chess players over 14 years old, should try to follow this routine for maximum results.”

source: https://thechessworld.com/articles/general-information/one-day-in-the-life-of-a-professional-chess-player/