I'm along the lines of Orion on this one (usually am). Up until recently, I would hold a few seconds nearly all the time to settle in.
Now, as my form becomes more ingrained, I sometimes release a second or so after anchor, other times it takes a few seconds to feel everything's right.
Importantly, I let down on occasion, when it doesn't feel right - which I find a great asset to my practice. "Rhythm of the shot" is a subtle but valuable concept, also.