i'd like a definate answer also.
i genareally leave it for 1-2 minutes if i havent been boosting at all,trying to keep the boost gauge showing vacuum for the last few minutes and around 3-4 minutes after spirited driving.
I have a an auto function and even after boosting hard it usaually is sitting between 1-2 minutes, even on the freeway, so dont really trust it.
anyone elaborate on this