How to Say "prolonged" in Spanish
The Spanish word for “prolonged” is “prolongado” — B1 level. This is a very common word in everyday Spanish.

Examples
El viaje fue muy prolongado debido al mal tiempo.
The trip was very long-lasting due to the bad weather.
Hubo un silencio prolongado antes de que ella respondiera.
There was a prolonged silence before she answered.
El uso prolongado de este producto puede causar irritación.
Extended use of this product can cause irritation.
Matching the Gender
This word must change to match the thing it describes. Use 'prolongado' for masculine things and 'prolongada' for feminine things like 'una espera prolongada' (a long wait).
Where to Put the Word
Like most describing words in Spanish, put this after the thing you are talking about. Say 'un efecto prolongado,' not 'un prolongado efecto' (though the second way is sometimes used in poetry).
Prolongado vs. Largo
Mistake: “Using 'largo' when you mean something was specifically 'stretched out' or 'extended' in time.”
Correction: Use 'prolongado' when you want to emphasize that something lasted longer than usual or was stretched over a duration.
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