So I last Sunday I brewed up an imperial IPA and used WLP001 for the yeast strain. I made a starter as usual and pitched like I normally do, which is around 68 F. Today is Monday (8 days after) and it is still in its active phase. Last night I was awoke by air streaming out of the air lock so when I went to put a blow off tube on I got beer all over the place. I tried to just crack the airlock in order to relieve pressure and the thing blew off. Usually the active phase of fermentation only lasts a few days for me and have never had it last this long. Has anyone else had this kind of experience?