See page 9. Best practice is still 1-30. The recommended policy will be modified to reflect this in the next release. For now, we suggest setting the policy to custom and choosing 1-30.
I see this too in Release 33 P51. The only reference I see in the Release Notes is to the following bug, but I don't quite understand it. Is the "1 per 60" a bug or a new "best practice"?