I would like a design for a (perhaps 3D printed) wall clock with one hand making one revolution per day, another hand making 100 revolutions per day, and perhaps a pendulum making 10 000 (or 5000) swings per day. DecimalFace.gifDownload GIF
That seems like a fun challenge.
I suggest breaking the project into many small steps and solving each one individually. Start by searching for a pendulum length calculator. You might find that 10000 swings per hour is more realistic. 10000 swings per day would need a really long pendulum. The rest is just gear ratios and arranging them to look good. Of course, this is an oversimplification. There are a lot of steps, but each one can be small. Eventually you will have your clock.