BAT VK-75SE & VK-51SE break in time

I have just purchased pre-power from BAT (VK-75SE & VK-51SE)driving Sonus Faber Cremonas floorstanding speakers. I just want to know how much time will be needed for the amps to break in and when it will be safe to crank the volume. My dealer told me that I should start the real listening after 60 hours and evaluate cd players (I am searching to buy a player) after 300 hours!! I am at 40 hours at the moment.