Great advice by gonzogolf, as usual. Your level of post-processing should vary based on the expected final usage of the image. Generally, most projects shouldn't require you to spend hours processing each image... you can sit there and nitpick and second-guess yourself all day, way past the point of diminishing returns - but unless you're genuinely improving, or learning something new, then it's better to wrap it up and move on to the next image or next set.
When I shoot in a blown-white background, I generally adjust solely in Lightroom: Add some global contrast, saturation, then move on to local adjustments. For people, I'll do a quick portrait retouch: Spot healing on major skin blemishes, judiciously use the Skin Smoothing preset on the adjustment brush (though I usually pull it down to about -50clarity and +12sharpening), maybe a quick swipe with Iris Enhance and Teeth Whitening presets, and maybe a little bit of dodge & burn, especially to lift and lighten dark circles under eyes or reduce the appearance of a pudgy jawline. I have an adjustment brush preset for Tattoo Enhance; I'll often use that too - most of my clients don't want their tattoos removed.
It's rare that I'll send something to Photoshop for retouching - most of the work I'm currently doing simply doesn't demand it. (though, I really need to get out of this comfort zone)
Of course, this is assuming that most of it is already correct in the camera. As mentioned above, with proper model prep and decent lighting, the eyes should already be bright, the hair will already be shiny, and the makeup should already look pretty good. And of course, your white balance should already be correct, based on in-camera white balance, or a custom profile from a ColorChecker if you're doing something color-sensitive like products or food.
If you're expecting to do background replacement, generally you don't want to do a blown-white background. First figure out the background you want to use, then light the subject so that they match that background. Let the studio backdrop fall to neutral gray; that'll be much easier to select and mask.