TinyIMG goes through several processes to optimize your images. Firstly, the app requests your images from Shopify which takes just 1 second for each one. Downloading each image takes 2-3 seconds depending on your image size. So if you have 1000 images, it could take up to 3000 seconds to load your images to the TinyIMG system.
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After that, the system starts the optimization process, which takes 1-2 seconds per image. Uploading the images back to your store takes 1 second per image. So, it might take another 3000 seconds to optimize and upload all of your images.
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All in all, if 1000 images need optimizing, it could take between 6000 - 7000 seconds (1hr 40 minutes to around 2 hrs). But don't worry, you don't need to keep the TinyIMG app open. The processes work in the background and we'll inform you when optimization is complete.