I use a KME sharpening system which is similar to the lanskey. It takes a while to set an edge, but once set, it gets impressively sharp. It also is easier, and much faster, to reset the edge after it has been done once. I use this same kit to sharpen broadheads too.
I would estimate it takes me 20 minutes to sharpen a typical knife I haven’t yet sharpened. It is only about 6-10 minutes to resharpen. It is possible to make the knife sharp in much less time, but to make it sharp enough to shave with takes more time.