At a push if I really needed to then I could do for £100 per hour yes If the customer really needs to know that badly and wants to gamble on it looking standard ish, but even then, if we found that we look say 8:01 and standard head in most of the map, but we have quite a lot of spark lead from 5000 - 7000rpm, is that from a compression change, fuel octane worn bores, camshaft profile? Or even just camshaft timing?

I think this conversation is going off on a tangent now as you seem to be looking at an ECU calibration as a supermarket product like "Are they beans, tomatoes or peas? who not just label them?" instead of the infinitely variable product which it really is when you get into modifying cars and actually writing the calibration live.