Samuel Elh correctly answered this.
if ( $type === 'portfolio' ) {
$terms = get_the_term_list( $post->ID, 'royal_portfolio_cats', '', $separator );
$term_array = explode(',',$terms);
if ( $limit = array_slice($term_array, 0, $max = 5) ) {
echo implode( ", ", $limit );
if ( count( $term_array ) > $max ) {
echo "...";
}
};
}
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