Index: src/wp-admin/includes/media.php
===================================================================
--- src/wp-admin/includes/media.php	(revision 56378)
+++ src/wp-admin/includes/media.php	(working copy)
@@ -3436,6 +3436,9 @@
 							echo ' ' . strtoupper( esc_html( $meta['bitrate_mode'] ) );
 						}
 						break;
+					case 'length_formatted':
+						echo human_readable_duration( $meta['length_formatted'] );
+						break;
 					default:
 						echo esc_html( $meta[ $key ] );
 						break;
@@ -3482,7 +3485,7 @@
 	if ( $media_dims ) {
 		?>
 		<div class="misc-pub-section misc-pub-dimensions">
-			<?php _e( 'Dimensions:' ); ?> <strong><?php echo $media_dims; ?></strong>
+			<?php _e( 'Dimensions:' ); ?> <strong><?php echo $media_dims; ?>px</strong>
 		</div>
 		<?php
 	}
Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 56378)
+++ src/wp-includes/media-template.php	(working copy)
@@ -477,7 +477,7 @@
 
 				<# if ( data.fileLength && data.fileLengthHumanReadable ) { #>
 					<div class="file-length"><strong><?php _e( 'Length:' ); ?></strong>
-						<span aria-hidden="true">{{ data.fileLength }}</span>
+						<span aria-hidden="true">{{ data.fileLengthHumanReadable }}</span>
 						<span class="screen-reader-text">{{ data.fileLengthHumanReadable }}</span>
 					</div>
 				<# } #>
@@ -720,7 +720,7 @@
 
 				<# if ( data.fileLength && data.fileLengthHumanReadable ) { #>
 					<div class="file-length"><?php _e( 'Length:' ); ?>
-						<span aria-hidden="true">{{ data.fileLength }}</span>
+						<span aria-hidden="true">{{ data.fileLengthHumanReadable }}</span>
 						<span class="screen-reader-text">{{ data.fileLengthHumanReadable }}</span>
 					</div>
 				<# } #>