from http://stackoverflow.com/questions/4136248/how-to-generate-a-human-readable-time-range-using-ruby-on-rails

ruby seconds to human readable

def humanize secs
  [[60, :seconds], [60, :minutes], [24, :hours], [1000, :days]].map{ |count, name|
    if secs > 0
      secs, n = secs.divmod(count)
      "#{n.to_i} #{name}"
    end
  }.compact.reverse.join(' ')
end

for milliseconds

def humanize millis
  [[1000, :milliseconds], [60, :seconds], [60, :minutes], [24, :hours], [1000, :days]].map{ |count, name|
    if millis > 0
      millis, n = millis.divmod(count)
      "#{n.to_i} #{name}"
    end
  }.compact.reverse.join(' ')
end