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The Spherical Stabilizer - like the Tracker and Planar Tracker - appears to operate in two steps: OK, so as to the specific question: there appears to be a significant inefficiency in Fusion related to the saving of large number of keyframes. But even at 60 FPS you won't hit this limit unless attempting to process videos of over 4.5 hours. As this is based on an arbitrary frame count, not timecode, the length in time would depend on the frame rate. You can have compositions longer than that length, but all nodes will stop processing at the 1 million frame mark. This appears to be a hardcoded limitation in the Global Out parameter.
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Firstly, to answer the question in the title: the hard limit on Fusion compositions is 1,000,000 frames.
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