Unclear What the 20-minute constant is actually used to time is not specified in the evidence.
What
The code path that delivers a thread follow-up message directly to a running artifact editor (enabled via the CLAUDE_CODE_EDITOR_CODELIVERY environment variable) now enforces a maximum length of 2048 characters on the follow-up URL it parses, and uses a new constant of 1,200,000 milliseconds (about 20 minutes) elsewhere in the same flow.
Why
The length cap guards against malformed or oversized follow-up URLs being processed; the roughly 20-minute value likely bounds how long the direct-delivery path stays valid, though the finding doesn't say exactly what it times out.
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What the 20-minute constant is actually used to time is not specified in the evidence.