Annealing is necessary in the neck, neck shoulder junction, shoulder and the shoulder case body junction. so I would make sure that these areas are submerged in the bath by at least 1/8th of an inch.
This would guarantee that the necessary areas would be annealed. I like the color transformation to reach about 1/4 inch below the shoulder body junction. the start of this color difference should be at least 1/8th inch from the shoulder body junction and indicates where the annealing stops.
More is not necessary and may be detrimental.
Just my opinion
J E CUSTOM