I just joined up to check out Eleven Labs and went with Free Version for now. I created one dub and that turned out OK. I tried another one and that failed (no reason given). Then I tried another dub but was not able to and was told I had no credits. So, with Free Version trial one's capability to do anything appears to be very limited.
#New user, starting with Free Version
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You have 10,000 free credits on the free tier but these go very quickly in the dubbing system.
That seems to be the case - 10,000 credits for one dubbing.