Peter,(posted 8313 days ago)I've heard many different stories as to what to do. Some say to start counting as soon as you start pouring. Some say wait until it is all there. Some pour out early in order to keep the developing time exact. Agitation can have the same confusion. At the top of the minute or the last few seconds?
The important thing is to decide your method for yourself and stick to it. Consistancy is the key here. It is more important to be consistant than to worry about being 10 seconds under or over.
Best regards,