The amount of downtime required for patching is not always same amount of downtime required for database maintenance. All of our live games are experiencing similar maintenance downtime tomorrow for North America, and this is because of maintenance and not the deployment of patch 1.0.6a.

For reference, "fastpatch" refers to the nature of the patch and what kind of content it includes, not how long it takes to deploy or how much downtime is required. Fastpatches are frequently very small and typically only contain a few changes (usually important bug fixes that can't be addressed with a hotfix).