I cheat a little in this area. I only shave about twice a week or so. Not because my job doesn't require it but because my hair does not grow very fast. I get a 5 o'clock shadow in about 2 days or so. I'm on the second day after my last shave and I now have a 5 o'clock shadow, so I will most likely have a shave tomorrow. Kind of sucks because of how much I enjoy shaving.
Hey, don't feel bad dude, we can't control the growth rate of our whiskers. Truth be told, most guys would probably love to have your whisker growth rate, as most see shaving as a chore.
If anything, your slower growth rate, teaches you to be more appreciative, of when you are able to shave. Its like a ritual of whisker weight reduction, provided by your favorite razor, and blade.
And, lastly, it saves on soap and water, if your not shaving every day. I myself have a higher growth rate then you, but I too, only do 2-day stubble shaves. Except on weekends when I do not shave, I will have 3-day stubble on the following Monday.
Your doing great, enjoy your wet shaving journey