Chip,

I see where you are coming from and agree with you as you are viewing it purely as a normalised duration from a mappers point of view.

As I have experience in ecu hardware and software design (not just my own products)
I tend to view stuff as it really is in the "real world" and as in what is actually needed.

In total simplistic terms I guess that makes Gareths original reply correct...LOL

I guess too much info can be bad...