[FEATURE] add time to JSONL "usage" property

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The JSONL log is useful. It records agent usage in tokens, but not the time Claude is "thinking". I would like that to be recorded in the JSONL log.

In Claude Code we frequently see status updates like this:

* Channelling… (2m 8s · ↓ 369 tokens)

and the tokens count shows up in the JSONL log, but the time Claude is "thinking" is not included, and it should be.

Proposed Solution

Existing usage property in example JSONL entry :

"usage":{"input_tokens":3,"cache_creation_input_tokens":37097,
"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":37097,"ephemeral_1h_input_tokens":0},
"output_tokens":3}

Add another item in this dictionary:

"usage":{"input_tokens":3,"cache_creation_input_tokens":37097,
"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":37097,"ephemeral_1h_input_tokens":0},
"output_tokens":3,"duration_ms":3307}

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

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