The strict responsive approach of Simvoly, uKit, and Weeby means you get no control over the mobile-only view. Gator, Ucraft, and Wix, by contrast, offer a mobile site preview and let you make customizations that only apply to mobile viewing. For example, you may want a splash page to welcome mobile viewers, or you may want to leave out an element that doesn't work well on the smaller screens.
On most builders you can create your website in less than an hour. We don’t recommend being quite so quickfire about it, though. The best way to make a website is to give yourself a solid day to play around with the software and fine tune your site. It can take much longer than this to make a website site though – it depends on how many pages you have and how much customization you need to do.