I have read Baldwins times for heating, cooling and storing.
@Ember I understand the circumstances which have to be met, thank you for those, because I do not have a readout from my fridge, for example, I was interested in Baldwin's time/temp chart:
below 36.5°F (2.5°C) for up to 90 days,
below 38°F (3.3°C) for less than 31 days,
below 41°F (5°C) for less than 10 days, or
below 44.5°F (7°C) for less than 5 days
@chatnoir The chart on cooling times makes interesting reading and I take your point on thickness.
Thanks also to @john.jcb I will go out and buy a sharpie