User-agent: *
Disallow: /
User-agent: Googlebot   # Google
Crawl-delay: 30
Visit-time: 1200-1300
Allow: /
User-agent: msnbot      # MSN
Crawl-delay: 30
Visit-time: 1300-1400
Allow: /
User-agent: Slurp       # Yahoo!
Crawl-delay: 30
Visit-time: 1400-1500
Allow: /