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Welcome to our community, donkeyyears (Interesting forum handle )
Some (maybe even Adobe support) will tell you there isn't. But realistically there is. Exactly what the limit is will vary. It's normally best to avoid using Full Motion. If you must, I might recommend keeping the projects as short as possible.
In actual use, we see that sometimes folks hit what I call "The red screen of death". Basically what happens is that each full motion clip loads into memory to play but isn't released from memory when it completes. During playback, the screen begins showing red squares and finally ends up with the whole screen turning red. This happens because all memory (physical AND virtual) has been exhausted on the PC.
Your colleague is probably close to the correct answer, donkeyyears, in terms of a maximum time, but there are many factors to be considered. So to rephrase your question (if you will pardon me for doing so), " How large can a full-motion recording - or a published Captivate file in general - be, before the file-size becomes too great to be smoothly viewed on the end-user's (not the developer's) machine?".
The answer may be 12-15 minutes, or not, because file-size issues are dependent on factors we don't have available right here, like movie size in pixels, and whether 16 bit or 32bit video is being recorded.
Do not worry about any "screen of death", red or otherwise, on your development machine (with due respect to the opinions of other posters). For example, if you are working on the latest and greatest computer in terms of CPU speed, Video capabilities, RAM, and internal pipeline speeds, but are building tutorials for viewers who have fewer machine resources and slower network connections, the only thing that really matters is at what point are your FMRs too large to be played on their computers. Hope this clarifies the issue for you, and others.