How long does a RAM upgrade take?

About ten to fifteen minutes max. The actual swapping takes five minutes—the rest is unscrewing the case and putting it back together. For a desktop, just power off, unplug, open the side panel, push the clips, pull out old sticks, line up the notch, and push in new sticks until they click. Laptops can be slightly trickier if you have to remove a bottom panel or battery, but still under fifteen.