OK so this isn't a wood geared clock. Lot's to learn from it though.
Here is a clock I rescued from a garage sale.
The only thing wrong with it was that the spring connecting the pendulum to the clock was broken.
Replaced the spring with a strip of mylar and everything was working again.
What's the point?
Compare how small the parts are on this brass clock with any of the wood geared clocks.
This Brass Clock shown here runs for 8 days on a single winding and chimes the hours and quarter hours to boot.
The inertia of the moving parts on this clock is much much less than what you'd find on a wood geared clock.
If the only difference between the two clocks was it's inertia, then the Clock with the lower inertia would run longer with the same torque applied to the escape wheel.
To be clear, the friction, pendulum length, wind resistance and any other factor you can think of (remeber this is theoretical) are the same for two clocks under consideration.
The only difference is that one of them has larger gears. You can simply scale up or down all of the parts in a clock except for the pendulum and it will work just fine. The smaller one will work a lot better though. See George Perzel's clock. He used the ACAD file from this website to cut gears on CNC. His clock is half size.
Wouldn't expect anyone to be able to make gears this small on a scrollsaw. Ahh but CNC. Sounds tempting!!!
The escape wheel isn't much larger than a coin.