how many!?! photoshopped

Not sure if this is for talk about photography or here but Ill try...

Post processing, touch ups...shooting glamour...I primarily shoot around 300-500 pics per model shoot...Of course you can't touch up all of them...but how many do you touch up? And how long does it take? This may sound like a vague question...because I guess it depends on what they are needed for but
Im feeling overwhelmed with what I should consider "keepers" to work on and what I don't, because it takes me about 25 minutes a photo...if thats ridiculously slow or not

I'd pick my choice of the best 1-5 to print out, but only PS one proof so he/she could see the effect.

Pick the best five and touch up as many as the client wants to pay for or as many as you agreed on in the contract. $40 per image beyond the first one for preview. Or if they are for you, you would obviously work on the ones you want to use in your portfolio. I wouldn't use more than one per shoot in a portfolio.