It means that I failed to understand something immediately. The amount of time in "some time" isn't specified, but the implication is that it's much longer than it should have been or would have been had I been paying attention.
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contrapositionWhat does it mean?You were in a situation where you did not have all the relevant information, or perhaps you discounted some of the information because you did not believe it was true. But later on, perhaps years later, you (suddenly or gradually) understood.