function __format_time -d "Format milliseconds to a human readable format"
  set -l milliseconds $argv[1]
  set -l seconds (math "$milliseconds / 1000 % 60")
  set -l minutes (math "$milliseconds / 60000 % 60")
  set -l hours (math "$milliseconds / 3600000 % 24")
  set -l days (math "$milliseconds / 86400000")
  set -l time
  set -l threshold 5

  if test $days -gt 0
    set time (command printf "$time%sd " $days)
  end

  if test $hours -gt 0
    set time (command printf "$time%sh " $hours)
  end

  if test $minutes -gt 0
    set time (command printf "$time%sm " $minutes)
  end

  if test $seconds -gt $threshold
    set time (command printf "$time%ss " $seconds)
  end

  echo -e $time
end