It might be one of the many reasons I have disasters in the clock room is cause I dont measure.
After I slice the egg(s) in half, lengthwise, and scoop out the yolk, I add about that many squeezes of mayo and mustard and mix into the bowl with all the yolks.
I dont think I would attempt to mix 2 dozen eggs yolks at once.
Serioulsy, I have no clue how much I put in. I would start out with small amounts then keep adding to a taste you are happy with. Same goes for the salt and pepper a few dashes.
Happy Easter to you too, happy mixing.