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I've searched and found no answer, and the GIF specification is over my head. What is the longest possible delay between frames in a GIF animation?
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A GIF (Graphics Interchange Format) titled 'As Long As Possible' or 'ASLAP' is scheduled to end in 3017, making it the longest known GIF. There are 48,140,288 frames which change in a ten-minute interval, making the loop last a 1,000 years.
Typically, GIFs have a frame rate of 10fps (or a 100ms delay) because they are simplified versions of a video.
Standard GIFs run between 15 and 24 frames per second. Overall, the smaller your GIF file size, the lower the quality will be. When creating GIFs for the web, it is all about finding the smallest file size possible without sacrificing too much quality.
So exactly 60 FPS is not possible. Note that this extension was meant for a handful of frames with a delay on the order of seconds (maximum delay is about 600 seconds), so 1/100 seconds resolution was ample. It certainly wasn't meant for video, and that's why the field encodes delay, and not frame rate.
Your reference says the delays are 2 byte unsigned integers and the unit is 100ths of a second. So the max duration in seconds would be (2^16-1)/100 = 65535/100 = 655.35s or about 11 minutes.
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