A escultura é efémera, por isso derrete ao fim de algumas horas.

Questions & Answers about A escultura é efémera, por isso derrete ao fim de algumas horas.

Why use ao fim de instead of just depois de for "after a few hours"?
The phrase ao fim de specifically emphasizes the completion of a duration of time before a resulting action or state change occurs. While depois de simply means "after" in a timeline, ao fim de algumas horas implies that it takes the passage of those specific hours for the melting to happen. It is the perfect structure for talking about how long something endures before resolving into a new state.
Could we use the future tense derreterá instead of the present tense derrete here?
You would use the future tense if you were warning someone about one specific sculpture right in front of you. However, using the present tense derrete here expresses a general truth or a permanent characteristic. Because the sculpture is efémera by nature, melting is simply what it always does.
The word efémera looks like the English "ephemeral." How does the accent mark affect it?
The acute accent on the first e tells you two things: it opens the vowel sound (similar to the "e" in the English word "pet") and it pulls the word's stress to that antepenultimate (third-to-last) syllable. Without the accent, normal Portuguese pronunciation rules would incorrectly place the stress on the second-to-last syllable.
Is por isso the only way to translate "so" in this type of sentence?
Por isso is the most common and natural way to link a cause to a consequence in everyday Portuguese. As a B2 learner, you could also use portanto or logo for a slightly more formal "therefore," but por isso is exactly what a native speaker would typically use here.

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