Crawl-delay: 30

User-agent: Googlebot
Crawl-delay: 10
Disallow:

User-agent: Yahoo-slurp
Crawl-delay: 20
Disallow:

User-agent: Msnbot
Crawl-delay: 20
Disallow:

User-agent: bingbot
Crawl-delay: 20
Disallow:

User-agent: Slurp
Crawl-delay: 20
Disallow:

User-agent: *
Disallow: /