The 30 day challenge is two fold, it gives you the time to adjust to the new look and it gives you enough practice to learn to shave efficiently. For some guys, it is instant love and they only need one shave and they are convinced to continue. Others are shocked to see their smooth head in the mirror, and/or the first shave caused a blood-bath. They need the time. The idea is to give yourself enough time with it to make an objective decision as to keeping it.
BTW - Welcome to the board. Your shiny head is looking real good. Several regular posters here are also bald by choice. I started that way, but nature has now caught up to me. Give us some background on yourself and why you have decided to shave your head.