I have bought new straights that were professionally honed and shave ready. I thought they all needed a few passes on my chrom ox .50 strop to smooth out the edges for a smoother shave for the 1st shave.
Since I learned to shave with disposable straight blades, I know what a very sharp blade feels like and shaves like and I know how these blades feel on a 2nd, 3rd, 4th, and 5th shave. This experience gave me great insight into keeping my fixed straights sharp and finding the way to do it.
The leather strop and canvass are more about realigning the fin/edge and sharpening the edge every so slightly. Each of my straight razors need a visit to my pasted paddle strop every two to five shaves depending on the straight razor. This has kept my straight razors going for 9 months without a honing, but a true honing will likely have to be done at the one year mark for each straight razor in my rotation.
Without the pasted paddle strop, I believe a touch up stone honing would have been in order about the 12th - 15th shave with the same razor. So my pasted paddles stop was a good investment for me as it allows me to get many more shaves with the straight razors between stone honings.
I hope this helps and good luck!
Pabster