Like I mentioned before, this depends largely on the speed of the USB drive that you have, so, ideally, you should use the fastest one available, in case time is of the essence. Unlike the official tool baked in OS X 10.10 Yosemite, DiskMaker X lets you know how long the process takes.
If you wish to use DiskMaker X to create the bootable OS X 10.10 Yosemite USB drive, here is what you need to do: At the time of writing this article, however, it is still in beta, which means that there is a chance that you may run into bugs. Like I mentioned earlier, it works with previous incarnations of the operating system the version of DiskMaker X that is compatible with OS X 10.10 Yosemite also works with OS X 10.9 Mavericks and OS X 10.8 Mountain Lion, according to the official page. It automates the process of creating a bootable OS X 10.10 Yosemite USB drive, but it still requires you to know which options to select. The More User-Friendly (Third-Party) ToolĭiskMaker X is the more user-friendly tool for the job. Rest assured that it will, usually in less than half an hour (the time element mostly depends on the speed of the USB drive that you are using - the faster it is the better). But, because it is basically barebones, the tool does not provide any indication as to how much time is left until the process completes. It is virtually bulletproof, gives consistent results, and works without problems.