Normalized on operating in float seconds rather than milliseconds.

src/Record/Record_Interface.php

@@ -23,7 +23,7 @@ interface Record_Interface {
 	public function get_origin();
 
 	/**
-	 * @return int Record duration in milliseconds.
+	 * @return float Record duration in seconds.
 	 */
 	public function get_duration();
 

src/Record/Sql_Record.php

@@ -43,7 +43,8 @@ class Sql_Record implements Record_Interface {
 	 * @return string
 	 */
 	public function get_description() {
-		$duration = round( $this->duration );
+
+		$duration = round( $this->duration * 1000 ); // s to ms.
 
 		return "{$this->sql} – {$duration} ms";
 	}
@@ -56,7 +57,7 @@ class Sql_Record implements Record_Interface {
 	}
 
 	/**
-	 * @return int Record duration in milliseconds.
+	 * @return float Record duration in seconds.
 	 */
 	public function get_duration() {
 		return $this->duration;

src/Record/Sql_Record_Collector.php

@@ -32,9 +32,9 @@ class Sql_Record_Collector implements Record_Collector_Interface {
 		global $wpdb;
 
 		if ( empty( $this->query_starts ) && ! empty( $wpdb->queries ) ) {
-			$this->query_starts[ count( $wpdb->queries ) ] = microtime( true ) * 1000;
+			$this->query_starts[ count( $wpdb->queries ) ] = microtime( true );
 		} else {
-			$this->query_starts[] = microtime( true ) * 1000;
+			$this->query_starts[] = microtime( true );
 		}
 
 		return $query;
@@ -63,7 +63,6 @@ class Sql_Record_Collector implements Record_Collector_Interface {
 				$category = 'query-write';
 			}
 
-			$duration      *= 1000;
 			$last_query_end = $query_start + $duration;
 
 			$query_data[] = new Sql_Record( $sql, $query_start, $duration, $category );

src/Record/Stopwatch_Record.php

@@ -36,7 +36,7 @@ class Stopwatch_Record implements Record_Interface {
 	 */
 	public function get_description() {
 
-		$duration = $this->stopwatch_event->getDuration();
+		$duration = round( $this->stopwatch_event->getDuration() );
 		$memory   = $this->stopwatch_event->getMemory() / 1024 / 1024;
 
 		return "{$this->name} – {$duration} ms – {$memory} MB";
@@ -46,14 +46,14 @@ class Stopwatch_Record implements Record_Interface {
 	 * @return float Timestamp of record start.
 	 */
 	public function get_origin() {
-		return $this->stopwatch_event->getOrigin();
+		return $this->stopwatch_event->getOrigin() / 1000; // ms to s.
 	}
 
 	/**
-	 * @return int Record duration in milliseconds.
+	 * @return float Record duration in seconds.
 	 */
 	public function get_duration() {
-		return $this->stopwatch_event->getDuration();
+		return $this->stopwatch_event->getDuration() / 1000; // ms to s.
 	}
 
 	/**

src/Record/Timeline_Iterator.php

@@ -26,7 +26,7 @@ class Timeline_Iterator implements \Iterator {
 
 		global $timestart;
 
-		$this->origin   = $timestart * 1000;
+		$this->origin   = $timestart;
 		$this->iterator = $iterator;
 	}
 
@@ -71,7 +71,7 @@ class Timeline_Iterator implements \Iterator {
 	 * Rewind to a topmost record set.
 	 */
 	public function rewind() {
-		$this->total   = microtime( true ) * 1000 - $this->origin;
+		$this->total   = microtime( true ) - $this->origin;
 		$this->current = $this->iterator;
 	}