This code should do the job for you. I haven't looked at what you pasted, it appeared to be too long and complicated. The code below is simple, you'll have to paste it in the JS section for each question. For it to work properly, you'll have to to do three things:

1. Create an embedded data field named "remaining_time" and set its value to the maximum time you want to give. (in seconds)


2. Create an embedded data field named "time_over" with value as "false"


3. Add a display logic from question 2 onwards to be only shown when "time_over" is equal to "false".

Qualtrics.SurveyEngine.addOnload(function () {
    var time_calc;
});


Qualtrics.SurveyEngine.addOnReady(function () {
    
    //Get the remaning time
    var rem_time = "${e://Field/remaining_time}";
    rem_time = parseInt(rem_time);
    that = this;
    time_calc = setInterval(function () {
        rem_time = rem_time - 1;
        
        // Update the remaining time every second
        Qualtrics.SurveyEngine.setEmbeddedData("remaining_time", rem_time);


        if (rem_time <= 0) {
            clearInterval(time_calc);
            // This line will create and alert that time is up. Delete it or you may change its text as you please.
            alert("times up");


            // This will skip the other questions and go the end of the block
            // Ensure that you have display logic set up accordingly
            Qualtrics.SurveyEngine.setEmbeddedData("time_over", "TRUE");
            // Auto advance
            that.clickNextButton();
        }
    }, 1000);
});


Qualtrics.SurveyEngine.addOnUnload(function()
{
    clearInterval(time_calc);
});

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