The default timeout value of 14ms is ideal when querying clipboard data while polling events, to prevent excessive lag if the source takes a long time to respond, however, when reading from SDL_GetClipboardData(), the timeout can be too short if a large amount of data must be processed or transferred. SDL_GetClipboardData() is not called while polling events, so using a longer read timeout to greatly increase the chance of success is acceptable.
Use a 5 second timeout when reading from SDL_GetClipboardData() and GetPrimarySelectionText() to greatly increase the chances of a successful read, even if the requested format requires heavy processing.
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