1beerbaron wrote:Allekornbrauer wrote:No basicly what i am asking is what count as the first day of fermentation is it right after I pitch the yeast into my wort or is it once I start seeing first sign's of fermentation ?
Start counting from pitching. There is activity before you are able to notice it.
This is how I understand fermentations too. That pretty much once liquid yeast are pitched they start going to town actively building up sterols to make their cell walls more pliable for budding during fermentation. But that doesn't mean that some of them aren't also already fermenting the wort and/or producing esters and phenolics to boot.