CloudWatch Events rule Limits

The basic limits are documented at http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_limits.html - currently 50 rules per account.

If you need more, reach out through your AWS contact and these can be expanded.

This is no longer 50 and has been increased to 100 per region per account.

As per this link:

https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/cloudwatch_limits_cwe.html

And as mentioned by johnny: this can be increased further on request (if amazon approves the request).