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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.
For a quicker start, you can presprout seed potatoes before planting. To do this, spread them in a single layer in a warm (60 to 65 degrees) brightly lit area, out of direct sunlight. Leave them there until stocky green shoots start to emerge from the eyes. This may take one to two weeks.