Often a very long time. People have been trying to work out how the universe was made for hundreds of years and we’re still not really close. Occasionalyl someone thinks we’re nearly there, then there’s some new discovery and voila! Back to the drawing board.
It depends, sometimes we are able to work out the solutions in a few months or a few years. Other mysteries like ‘how did the universe begin’ we’ve been trying to understand almost since the beginning of human civilization, and we’re still not there yet,
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