Of course if one needs 40 minutes to work the delts, rather than frying them in a 8 to 10 minutes high intense, TUT workout, than that's their business. Less will usually prove to be more, with regards to steady progress in size and strength. But if one enjoys those marathon 40 minute delt workouts, than good for them.
A micro/macro diet, though highly important. is just one of the factors in the biochemical process of the body. A prime key is the CNS, allowing and adapting it to future stress levels that the next workout will produce (or should produce....in theory anyway). Eating meals (perhaps smaller ones, 5 to 6 times a day) has quite a bit to do with the requirement of the body's nutritional needs. That's where meal replace packs can come into play, between regular meals. Good Luck.
Side Bar: Hi sexpert (aka donny). Sorry about those personal problems of yours. Kind of cuts down on your computer time on line, I know. Might take an effort to seek professional help, if not doing so now..Good Luck.