Dude, dumbbell bending won't take long. You may want to ask about the training plan for the number of dumbbell bends and groups. Dumbbell bending is usually aimed at the training of biceps brachii, so training biceps brachii requires a variety of actions to stimulate biceps brachii at the same time: four groups of barbell wide grip bending, four groups of dumbbells in each group alternately bend, four groups of barbells in each group 10-10 narrow grip, and muscle stimulation in each group10 wide grip and narrow grip. Wide grip stimulates the outside of biceps brachii, while narrow grip stimulates the inside of biceps brachii. I wish you a happy fitness!