Excrept length at single post

You can see it at: https://ebizlatam.com/santex-acuerda-con-el-gobierno-argentino-ofrecer-cursos-de-xacademy-en-la-plataforma-capacitar/
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Hi, I want to show the excrept at the single post template adding this to functions.txt
add_shortcode( ‘output_post_excerpt’, ‘get_the_excerpt’ );

And this to the template in a Single External Shortcode:
[output_post_excerpt]

But the excrept shows only the first 30 word.

How can I change the lenght to (by example) 100 words?

Thansk in advance,

José.

Thanks, it’s solved… was my mistake.