Oh man, that thing. I actually like GregTech (enough to have made 3 fusion reactors in the server I used to play), aside from most of his EU generation being awful, but I am dreading those updates. Seriously, who wants to wait 80 seconds to use a more efficient circuit recipe?
40 seconds (800 ticks; 20 ticks/second; 1 EU/t)
And there are also overclocker upgrades for machines now (right click machine with it, machine is permanently upgraded) which double the speed of the machine, and quadruple the EU cost.
So...
0 overclockers -> 1 EU/t; 800 EU total; 40 seconds
1 overclockers -> 2 EU/t; 1600 EU total; 20 seconds
2 overclockers -> 4 EU/t; 3200 EU total; 10 seconds
3 overclockers -> 8 EU/t; 6400 EU total; 5 seconds
4 overclockers -> 16 EU/t; 12800 EU total; 2.5 seconds
5 overclockers -> not possible (max is 4).
Later on, you would probably just toss a stack of materials in and leave it to produce extra circuits for the next time you need them, or, if you have an automatic crafting system that can handle it, set it up to keep a buffer of finished circuits so that any crafting finishes immediately.