Sounds like he's listened to some of SLR Lounge's videos where they intimate by using their Lr preset system, you can speed up editing.
If there is consistency for each wedding shoot, then it's doable. However, given that some images are shot in JPEG, and some in RAW, there's no way to establish any sort of consistency.
The owners expectations are somewhat unrealistic. He needs to have each of his photographers shooting in RAW only. That'll give you the best image and widest latitude for editing.
You can do some cookie-cutter presets to address the main things he wants - adjust exposure, change the camera profile to [CAMERA] Portrait, add a vignette, adjust up/down 1, 2, 3. stops.
If there is consistency for each wedding shoot, then it's doable. However, given that some images are shot in JPEG, and some in RAW, there's no way to establish any sort of consistency.
The owners expectations are somewhat unrealistic. He needs to have each of his photographers shooting in RAW only. That'll give you the best image and widest latitude for editing.
You can do some cookie-cutter presets to address the main things he wants - adjust exposure, change the camera profile to [CAMERA] Portrait, add a vignette, adjust up/down 1, 2, 3. stops.