Minor repairs, patch holes, etc.. then a fresh coat of paint and he is usually done by the end of the next day.I try to stage supplies and contracts/handyman for the day after the tenant moves out.

Just a coat of paint can be several thousand, while I have seen TI work be done that cost hundreds of thousands and have to close for 3 months, depends on the work.

Change the countertops, lighting, and appliances, and a fresh coat of paint and carpet.

Kitchens can get totally coated in surface grease in 2 years if someone fries food at all.   

@Carson KesnerGoogle a product called "fiberlock recon"...its a type of paint...no cleaning or prep required....one coat and your done, must be sprayed on...works fantastic!!!!

I didn't ask if the water heater had already been replaced or if that was the leaky one.Most of the inside needed a coat of paint.

I usually charge $20-50 for the patching you described, should be 20 minutes(or less).ALSO, I strongly suggest you use factory premixed color, I use Home Depot Behr Swiss Coffee, it makes it easy to blend future repairs and when we have turnover, its just quick freshen up coat, without having to go full on multiple coats of paint and primer, or set up for spraying, etc.

Usually I get on the phone and talk to potential clients about there specific situation.Most NNN deals are standard boxes with just what we call (gingerbread) on them which is the coating for a particular brand. 

But way too many people "sugar" coat the business and the true facts about it.  

The property is only about 10 years old and generally seems to be in good shape; minimal improvements would be needed outside of a fresh coat of paint, carpet in common areas and landscaping.