The map indicates that the Industrial Revolution began in Great Britain in the 1840s and then spread to various countries in Europe over the subsequent decades. If we assume that the spread to Russia would follow a similar timeline, and based on the countries labeled on the map, we can infer that it likely took approximately 30 to 40 years after the 1840s for the Industrial Revolution to reach Russia.
Given the provided options, it would be reasonable to choose about 30 years as the best estimate for how long it took the Industrial Revolution to spread to Russia, taking into account the gradual nature of this process across Europe.
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