Some things go wrong with your code

• typos: substitute the braces after getMinutes with normal parentheses
• getMinutes doesn't calculate correctly:

  -1h10m => -50  # correct -70
  -1h20m => -40 # correct -80
  [download]

  so the sorting is not correct.
• You are calculating the getMinutes values more than once per entry. See my solution elsewhere in this thread for a way to cache these results.

-- Hofmator

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