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The max_cache_time parameterizes how long of a history to store for each transform. In general it will determine how much memory is used storing the older data. A longer cache will have low overhead as long as you don't query far into the past very often.

The length of the cache determines how old a timestamp you can query, once the cache has been filled.

It will not have an effect on waitForTransform as waitForTransform only goes forward not backwards. (It assumes new data will be newer.)

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