In real time they have 12 hours and they show you the highlights. They build such things as a Windmill to grind coffee, a cannon to shoot a football and a bridge layer. Next week is a steam powered car and a giant lawn mower. Sometimes it drags on but it's just like the A-Team only for real and less violent. At worst you can record it and fast forward through the boring parts.
People build combat robots then fight it out.
The only problem is the show is about 20 minutes and they only fight for 3 minutes a round. Too much talking and not enough fighting. I was flipping channels when I saw a pool full of chicks in bathing suits. That was enough for me, I was hooked. Look around at the competition I've found that is the only one worth watching.