I kegged on July 31st. Two fermenters have been sitting on the bench in my garage since then. There is about a quarter inch of beer sitting on top of the yeast/trub. It was pretty warm for the first 4-5 days (mid 80'sF), it has cooled down to mid 70's since. I am away right now and would not be able to harvest the yeast until Sunday. I could buy more yeast, not a big deal, but would like to reuse what I have. Will it be too late to harvest this yeast come Sunday?