How is the totalTime calculated?

[desmeit]

I have the following settings:

ImageSequenceAnimator(
                "assets/sequence",
                "",
                0,
                4,
                "png",
                30,
                key: Key("offline"),
                fullPaths: null,
                // color: color1,
                fps: 30,
                onReadyToPlay: onOfflineReadyToPlay,
                onPlaying: onOfflinePlaying,
              ),

I see a totalTime of 990. How can this be?
30 images * 30 frames is 900.