Getting started is not dependent on long-running analytics jobs on your historical data, although initial uploads are welcome to mitigate «cold start problems». The setup process for a new recommender service is extremely quick once your needs are defined, producing good recommendations based on incoming data. The Gravity system will simply consume input about user interaction (purchases, product page views, recommendation exposures etc.) to keep its recommendations up-to-date. Most of this input is automated through the default setup.
If you're eager to get started, you can