[Exalted] Implict Construction Methodology

[nolispe]

In the Errata, it states that Implict Construction Methodology may only be applied to one roll per project. Now, that makes complete sense with the "all dice become successes" bit. However, the second bit of the charm - which reduces the interval time - how is that effected? Does it reduce the time for one interval, so the first interval takes an hour and the second takes a season? Or does it apply the whole way through the project? As I see it, the arguement for the former is that the whole charm only applies to one roll, IE one interval, while the latter is seemingly supported by the wording 'supplemented by this Charm, each die...' in the charm text.
And thus I ask the playground. Which is it?