Don’t stress about exact days. Potatoes are forgiving. They’ll wait for you. You can harvest early for small, tender ones, or late for big, mealy bakers. The range of 70 to 120 days is just a guideline. Your real job is to have fun, get your hands dirty, and eat something you grew yourself. And when someone asks, “How long does it take for potatoes to grow?” you can say, with a sly grin: “Long enough to make you hangry, but short enough to try next season.”
Now go get a seed potato. Find a bucket. Start the clock. Your future fries are waiting.