The 30 hours was illustrative, and you've found the assumption hiding in it: that the mobile view behaves. A simple one-page site can come in under that. Once the phone layout starts fighting you, with columns stacking in the wrong order and text spilling out of buttons, every fix is a manual override inside the template's limits, and the total stops being predictable. Mobile is exactly where builders eat the time. On the custom sites RayaStats builds, the phone layout is designed alongside desktop from the start, so there's no template to fight.