I do about 30 sets for triceps.
For real, that shoulder routine takes about 45 mins tops. You are not doing forced reps or negatives or drop sets or any of that shit like that which does nothing but compromise your form and risk injury.
Look at it this way. Your side delts are what?? as big as your two fingers? You dissect that muscle and you will see the actual side delt is not very big at all. So why you want to throw heavy weight at such a small muscle? You can't possibly stimulate it enough without incorporating and recruiting additional muscles. So your side laterals, effectively become a compound movement for the whole shoulder girdle. You target that tiny muscle with high reps, volume sets and you push that blood in there to stretch that muscle from the inside as much as you can. My shoulders don't lie.