How long do you hold your anchor?

[Flying Dutchman]

Thanks for the great answers all of you and especially the last one from Terry. Its is going much better now.
Before I even pull the string, I am aiming already.  The I keep on aiming when pulling the string. Anchoring double wit my middle finger in the corner of my mouth and lower thumwrist against my ear (behind the jaw). I just hold it for a split second to find my anchor, release and rip with my fingers the back of my head. Sometimes I forget to anchor, but I am making progress fast now.