How does shooting with a release affect your draw length or doesn't it at all?

it shouldnt if its fitted properly!! A loop will affect it. but if your release is set at its proper length you should still be at your original draw lenth, thats why its important to purchase a release thats adjustable. not every hand and wrist is the same.

I shoot finger style for target competition and hunting. I also have a bow setup for 3-D that I shoot with a release. There can be quite a difference in draw length depending on you anchor point, if a string loop is utilized, overdraw if any and the length of the release. From my finger tab to the Cascade rope release my draw length is 1 3/8” inch shorter. The Cascade is a rope release and my anchor is not at the back of my jaw, but under. You should pick a release you plan to shoot and measure at full draw with the bow setup to get an accurate draw length. You may feel comfortable at the same draw than again there may be longer or shorter than what you are shooting now.

If your a finger shooter and go to a release, again depending on your anchor, you'll need to lengthen your draw. Most finger shooters bring the string to the mouth usually around the nock of the string. Most release shooters bring the string beyond and behind the mouth to the side of the face allowing for a longer draw. Of course as mentioned above, using a loop or same device shortens this