TweenAnimationBuilder<Duration>( duration: Duration(minutes: 3), tween: Tween(begin: Duration(minutes: 3), end: Duration.zero), onEnd: () { print('Timer ended'); }, builder: (BuildContext context, Duration value, Widget? child) { final minutes = value.inMinutes; final seconds = value.inSeconds % 60; return Padding( padding: const EdgeInsets.symmetric(vertical: 5), child: Text('$minutes:$seconds', textAlign: TextAlign.center, style: TextStyle( color: Colors.black, fontWeight: FontWeight.bold, fontSize: 30))); }),