How many years does it take for an amendment to be approved by states

heres an example:

Proposed amendments must be ratified by three-fourths of the states in order to take effect. Congress may set a time limit for state action.

(ya yeet)

explanation:

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roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.