Is 15 days to long.

[Robdog]

Is 15 days to long to leave a brew before putting in a cornie.

Im just a little worried its to long for it to be sitting on the yeast and may develop some weird flavours.

I really have got to work my timmings out better so i have time to keg after 10 days.

[Cheshire-cheese]

Is that 15 days in the primary FV?

[Robdog]

It is mate yes, sorry i should have added that.

Ive gone up to 12 days before without any problems but i know its not ideal to leave it much longer than that.

[clogwog]

You'll be fine for anytime up to a month or so.
Even up to 6 weeks is unlikely to cause problems.

I normally leave mine in primary for between 2 or 3 weeks as standard practice.
I like the yeast to clean up after itself and settle out as much as possible before I bottle.

[Philipek]

I leave mine in the primary fermentation vessel for just a day or two under 3 weeks.

John Palmer says that three weeks is fine, but after that there is a risk of autolysis. However, loads of US brewers claim to have left their beers in the FV for months and months and not had a whiff of autolysis (which is a good thing because it is, apparently, pretty stinky). Indeed, many of them claim that autolysis is a myth. Not wanting to tempt fate, and not having a secondary vessel, I bottle a couple of days before the the three week mark and my beers have been fantastic (despite all my silly mistakes).

[Parva]

Mine tend to get 10-14 days (due to being bone idle largely) and they tend to be better than those brews that I put into a cornie after 7-8 days. I'd certainly have no worries about stretching as far as 3 weeks if I needed to.

[Whorst]

I generally ferment for 7 days, then rack into the corny. 3 weeks in primary is way too long unless you're brewing rocket fuel.