Wait/Delay

#1
Hi my screen is changing for every minute with the same image but the positions of the image is different. Need to capture the particular image and the timing of the image also changing. One time it comes in 30 sec and once it came in 45th second like that randomly the image timing also changing but the image with the particular position is not changing. So How to capture the image timing? Tried wait for screen change but it didnt work.
Thanks in advance for your response.
 
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