A Geogebra lesson can get messy quickly. Planning what you are going to do takes time. Below is a screen shot of my plan as well as a video of me talking through the process. As you get used to using the tool, the planning can take less time, but you should know what you want your activity to do before you start so you have an idea for how you want the pieces to fit together.

Used the circle tools[br]Sliders to control rotations (4320[math]^\circ[/math] in 6[math]^\circ[/math] increments)[br]2 different angles based on the slider. The minute hand rotates based on the value of the slider and the hour hand rotates based on the slider divided by 12.[br]Defining variables based on the slider to input text into the digital clock