Sprite Animation Length is too Fast

I made an animation by dragging in 11 different sprites, going from keyframe 1-11. I have the animation set to 12 Samples. It returns a length of 0.0888888883 when I get the length of it in code. I have other animations from a sprite sheet that also use 12 samples and they play at 0.5 seconds.

How can I adjust the custom animation I made to change the length? I tried changing the samples, but the length returned in my code was the same.

@Frankie3 In your animation tab you can move the sprite animations nodes. You can adjust them to change when you need them to. Etc. place one sprite change every 0.125 sec and your animation will last 1.5s