my audio file is 88s long but an error tells me it exceeds the limit of 90s /

I play an audio file in my SSML answer that lasts 88s,but I procure this error in the Alexa answer:
Invalid SSML Output Speech
The audio exceeds the allowed maximum length of 90000 milliseconds.
Note that the answer contains another audio file, along with text. Does the 90s limit apply to each audio file, or to the combined duration of audio files played in a single answer?

Thanks!

Source: amazon.com