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But it can take 70-90 or more for potatoes to mature. This depends on the variety. The potatoes can carefully be harvested at 7-8 weeks for a early harvest of small potatoes. For full grown potatoes you would harvest in the fall when the leaves turn brown. But it can take 70-90 or more for potatoes to mature.
If you planted seed potato pieces in a shallow trench, then the method is to plant with their eyes up (cut sides down). It will take about 2 to 4 weeks for stems to emerge with this method. You can always replant if it has only been 2 days. Just make a shallow trench (about 4 inches deep), plant, and recover with soil.