It is hard to describe what a normal growth of microgreens looks like. One of our seed suppliers has a great video on growing mustard microgreens and we took a screen capture from the video that illustrates what a typical growth cycle will look like. Note that the microgreens will accelerate their growth greatly once the leaves form and they get sun.
Note how the plants grow about an inch between day 3 and 5. The seeds took 3 days to emerge from their seeds and reach a small plant size, it appears that they doubled again at day 7 or so and doubled again to get to day 10 ... exponential growth of the microgreens. Note that at day 10 you are ready to harvest as the first true leaves are starting to appear and this is the optimum point for nutrition and taste. This crop is indicative of most microgreen growing but speed and size will vary by variety and growing conditions. This can serve as a general guide of what to expect.
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