It took me about 12 hour to install the first one  10 minutes to do the second one. I’m so happy with them that I ordered 2 more! I love that it’s made in the USA by a family-owned business!!! I highly recommend this product. Accurate measurements are critical!
FYI - a right angled tool to make it easier to screw the brackets in would have been helpful, but not necessary. I was able to make it work tight quarters working inside a cabinet!