eh, i dont think it matters that much, i see too many times where peopel get overly religius with there turbo timer. like its set for 2 mins, and they roll thought a parking lot for 5 mins looking for a space and still think they need that 2 min timer running.
it only takes a few seconds to cool that baring down after a hard boost run. not 2+ mins.

mark is right, most people will push a cheap setup to its limits before just spending the money on a good setup that will make more power with less stress.