@Nathan585 I moved your post over to this existing thread: Limit to number of tracks on a playlist?
There actually is a limit of 5,000 tracks on a playlist.
While that is a number that is continually being tested and subject to change, check out the accepted solution to this thread for more information.
If you'd like to be able to create a playlist with more than 5,000 tracks I recommend creating a feature request for it here.
Hope this helps!
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