If you want to the gif-animation to repeat a certain number of times, then you could just load the frames into an array, pick a an image from that array on every frame and display it. When you reach the last frame you start again with the first.
By counting the displayed frames you can determine how often the animation has repeated.

1. import gifAnimation.*;
   
   PImage[] animation;
   int n = 5;
   int framesPlayed = 0;
   
   
   public void setup() {
     size(400, 200); 
     // create the PImage array from the gif
     animation = Gif.getPImages(this, "first.gif");
   }
   
   void draw() {
     background(0);
    
     // dislpay current frame of the gif
     image(animation[framesPlayed % animation.length], 10, 10);
   
     framesPlayed++;
   
     // check if gif has played n-times
     if(framesPlayed >= n*animation.length){
       framesPlayed = 0;
       // replace gif with a new one
       animation = Gif.getPImages(this, "next.gif");
     }
   }