The first time you create settings to auto-retweet terms, or if you update your auto-retweet settings, it can take anywhere up to 30 minutes before you see the auto-retweets begin. After this period, retweets will happen steadily.
We also have some restrictions on who will be auto-retweeted in order to prevent spam. These restrictions appear on recently created twitter accounts, accounts with little to no followers, and accounts following an excess number of users in comparison to the amount of people following them.
Of course, if you believe this is not the case, or wish us to change any of these restrictions, please create a support ticket and let us know.