nicholasrq/lt-analytics — pull request #2 by fenelon (2013-03-30 21:29:45+00:00)
Title: Implementing _setCustomVar key-value limit (testing needed)

For any web property, you can create as many distinct session-level custom variables as can be defined with a 128 character key-value pair limit.

https://developers.google.com/analytics/devguides/collection/gajs/gaTrackingCustomVariables?hl=en