Over an hours my tweet post, Twitter update "Zz(つωˇ)" and Profile image change

toumin.rb

#!/usr/bin/env ruby
#-*- coding: utf-8 -*-
require 'twitter'

Twitter.configure do |config|
  config.consumer_key = 'YOUR_COMSUMER_KEY'
  config.consumer_secret = 'YOUR_COMSUMER_SECRET'
  config.oauth_token = 'OAUTH_TOKEN'
  config.oauth_token_secret = 'OAUTH_TOKEN_SERCRET'
end

created_at  =  Twitter.user_timeline("kimihito_").first.created_at
now  = Time.now

time = now - created_at

HOURS = 60 * 60

icon = open("./icon1.jpg")
iei = open("./iei.jpg")
if time > HOURS
  length = time / HOURS 
  Twitter.update_profile_image(iei)
  Twitter.update("Z" + ("z" * length) + " (つωˇ)")
  sleep 1
  Twitter.update_profile_image(icon)
  puts "Tweeted"
end
  length = time / HOURS 
  Twitter.update("Z" + ("z" * length) + " (つωˇ)")
end