How to get data from tables/lists into LLMs

Hello,

My objective is to build a process that retrieves data (reviews, formatted as JSON) from an API endpoint. This data will then be sent to an LLM to determine if each review is positive or negative.

Initially, I utilized a Split Out node to send each review individually to the LLM. Later, I discovered that I could pass the entire list directly.
Now, I'm curious about how this functionality operates. Does it invoke the LLM a single time, or once for each item in the list? I suspect it's only once, as otherwise, I wouldn't grasp how the prompt would function, but I would appreciate confirmation.

Just to be sure, I don't need to split the data.

Thanks