The maximum reward for the Chronomatron is reached at 15 notes, and the maximum reward for the Ultrasequencer is reached at 20 notes.
In the interest of saving time, an option should be provided by the Enchanting Solver options to disable the solver at this threshold, allowing the user to complete the minigame for maximum rewards without having to complete the entire game.
According to the Hypixel Skyblock Wiki page for the experimentation table:
https://hypixel-skyblock.fandom.com/wiki/Experimentation_Table#Trivia
The maximum reward for the Chronomatron is reached at 15 notes, and the maximum reward for the Ultrasequencer is reached at 20 notes.
In the interest of saving time, an option should be provided by the Enchanting Solver options to disable the solver at this threshold, allowing the user to complete the minigame for maximum rewards without having to complete the entire game.