hey paco,
well they were doing in excess of 500 commercial flights a month, so if it saves just 5 minutes per flight, that is 500 x 5mins x 2 pilots x 12 months = 60000 minutes = 1000 hours, allow another 1000 for rotors running between flights where it is much more than 5 mins per flight, and the flights were starting in the morning and often running back to back, thats 2000 hours = 3 pilots.
if everyones hours are nowhere near FTL max why bother, but when your pilots are bumping limits it really makes a difference !
regards
CF