Millisecond Converter

Simon Willison's Blog / 4/24/2026

💬 OpinionSignals & Early TrendsTools & Practical Usage

Key Points

  • Simon Willison created the “Millisecond Converter” tool to help translate LLM prompt durations from milliseconds into seconds and minutes.
  • The motivation for the tool is that many LLM reports present timing data in ms, forcing users to do repetitive mental conversions.
  • The post frames the converter as a simple usability improvement for working with LLM performance measurements.
  • The tool is presented as part of Simon Willison’s ongoing collection of practical developer resources.
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24th April 2026

LLM reports prompt durations in milliseconds and I got fed up of having to think about how to convert those to seconds and minutes.

Posted 24th April 2026 at 4:23 am

This is a beat by Simon Willison, posted on 24th April 2026.

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