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So, my Dell that I purchased a few years ago came with Windows 10. At the time, I hated it (Windows 10 that is). So, I bought a Windows 7 disc, and have been using that since. Several times, I've tried re-installing 10 again (I made an image on an USB). The link to the image file that I downloaded was given to me from Dell, and matches my P.C.. For some reason, it take 7 hours to install from my USB. Is this normal? So, after all the updates and stuff, it's about a 15 hour procedure. Seems kind of excessive to me...
If it's a storage device with USB 2.0 speed or slower yes that could be the right. Try to get a USB 3.0 stick and try from that. Also make sure you are connecting the USB 3.0 device in to a port supporting this, they will be coloured blue on your Dell.