If you have just finished setting the TiVo up it will have downloaded the first round of guide data but it won't show up for anything up to 24 hours while things index.
There is a way of forcing a call via TiVoWEB. Point your web browser to the IP addess of the TiVo and you will find it under the "phone" tab.
The TiVo does not have a defined time it gets it's data. It is dependent on what other system tasks are working and the like. It is generally around once every 24 hours or so.
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