Speaking from what works for me....you should not try and force your shot into a certain time frame. What I mean is this: Develop a shot sequence or shooting routine that involves walking yourself mentally through each critical step of your process. When I have completed all the steps in my shot process,(stance, bow grip, draw, anchor points, etc.), my last step is to focus on my target/sight picture as I am building back tension till my shot goes off. If I think anything like "release now" or "shoot" aka commanding my shot to go off consiously, bad things happen. Sometimes that takes more time than others, depending on the shot. Focus on the spot or your sight picture (depending on how your aiming method works for you), and when it's right, it will happen. Everyone is a little different in how they approach the mental side of shooting an arrow. Find a shooting routine that allows you to be consistent and accurate, and the timing will come. If you need to speed up or slow down you can practise for that, but not until you have a solid routine planted firmly in your mind. Hope this is helpful and makes sense!