If you enjoy harvesting the qi and want to do it every time you practice during the day - then that's excellent(good,better,best) otherwise use a shortened version as suggested by Jeffrey. You can do what Jeffrey has indicated or choose your own favourite bits of the exercise - like patting your body or rubbing your tummy clock-wise 9 times, or massaging and cupping the kidneys etc.
I don't see why you couldn't use harvesting the Qi as a stand alone exercise if you like it a lot - all of the individual components of the exercise have their own specific benefits - tapping the tailbone for example is very good for opening the sacrum - cupping and massaging the kidneys is a wonderful exercise for increasing the energy in our kidneys (our lifeforce) - moving the neck from left to right and right to left is amazing for stiff necks, and on it goes.
Go with your flow!
