Lots of discussion about this last week. No, it won't interfere with any of the other stances. You can turn it on and forget about it, basically. It isn't on a timer or anything else. Probably the only way it will get turned off is if you die, like any other stance. That might be slightly inconvenient for some people, but not a huge deal overall. Just one more "buff" to make sure you have on at the beginning of a quest.