from: http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=40907
The limits for an AdWords account are:
- 25 campaigns
- 100 ad groups per campaign
- 2000 keywords per ad group
- 50 ads per ad group (any format)
- About 50,000 keywords per account
Most advertisers do not reach this limit. In fact, many accounts are best organized by creating one campaign and several ad groups within that campaignand two or three ads and 10-35 keywords within each ad group.. Learn more about structuring accounts.
If your ad groups are close to reaching their keyword limit, we’ll place a notice in your account. Learn more keyword limits and how to create an effective keyword list.
In rare instances, advertisers may need more than 25 campaigns to effectively advertise their products or services. For these cases, advertisers can create multiple accounts and link them using a My Client Center account.
