I let mine sit for about 30sec(turbo timed) Once in a blue moon on the freeway I let boost have it's way for some spirited driving afterwhich I'll set the time to 1min or so. If I remember right in the Blitz manual it says for every half hour to an hour or so in boost u should set the car to idle a few minutes or so. Just let it sit a bit(few secs to a min) it won't hurt.
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