I'd go 5 minutes.
I don't think I've ever EOC'd for more than 5 minutes.
That'd have to be one loooooonnnngggg stoplight too.
Oh, and just for kicks I picked up another 6 conductor phone wire, so I'm gonna try for hooking up the MPGuino in the wife's 99 Cavalier after my Civic gets all ironed out.
*EDIT*
A few short hours later....
It's working!!! I had the VSS and INJ wires switched like I thought. Oh, and the INJ wire from the ECU won't work. I got the INJ signal from the injector harness in the engine bay, found the wire with a DMM just like dcb said.
It works like a charm, I just have to find out how to guesstimate my VSS and INJ parameters to better fit my Honda instead of a Saturn.
A quick run around the block showed 1.01 miles, 0.03 gallons (I think) for a total of 38.84 MPG. But again, prolly a bit off b/c it's not exactly setup for a Honda. Yet.