Il trouva finalement la solution à deux heures du matin.

English Translation

At 2:00 a.m. he finally found the solution.

There should be a note here that this is le passe simple. As such, don’t use it in conversation!

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Indeed, it’s very bookish, the neutral form with the passé composé would of course be:

Il a finalement trouvé la solution à deux heures du matin.