assign a listener to oninput of the text boxes. Store the time of each input as an array. Keep the first and last.

@ahmedA
hmm how do I refer to the text boxes though? for example, I know the next button is referred to as NextButton, but I'm not sure what to call the text box inputs.
could you show me an example of using oninput on textboxes?

Here's the code:
Qualtrics.SurveyEngine.addOnReady(function () {
    let quest = this;
    let time_arrays = {};
    let all_inputs = quest.questionContainer.querySelectorAll(".InputText");
    all_inputs.forEach((text_box) => {
        time_arrays�text_box.id] = �];
        text_box.oninput = function () {
            time_arraysntext_box.id].push(Date.now());
        };
    });
    document.querySelector("#NextButton").onclick = function () {
        Object.keys(time_arrays).forEach((id) => {
            let id_time = time_arrays�id].pop() - time_arrays_id].shift();
            Qualtrics.SurveyEngine.setEmbeddedData(id.replaceAll("~", "_") + "_time", id_time);
        });
    };
});

It should work for any question with a text entry box. You'll have to setup embedded variables looking like the image below.