If the number of time values can vary between 3 and 4, you can modify the sumTime function to accept an array of time values.

function sumTimes(timeArray) {
    // Initialize total hours, minutes, and seconds
    let totalHours = 0;
    let totalMinutes = 0;
    let totalSeconds = 0;

    // Iterate through each time value in the array
    timeArray.forEach(time => {
        // Parse time value
        const [hours, minutes, seconds] = time.split(':').map(Number);

        // Add to the total
        totalHours += hours;
        totalMinutes += minutes;
        totalSeconds += seconds;
    });

    // Handle carry-over from seconds to minutes
    if (totalSeconds >= 60) {
        totalMinutes += Math.floor(totalSeconds / 60);
        totalSeconds %= 60;
    }

    // Handle carry-over from minutes to hours
    if (totalMinutes >= 60) {
        totalHours += Math.floor(totalMinutes / 60);
        totalMinutes %= 60;
    }

    // Format result
    const formattedResult = `${padZero(totalHours)}:${padZero(totalMinutes)}:${padZero(totalSeconds)}`;

    return formattedResult;
}

// Helper function to pad single digits with zero
function padZero(num) {
    return num < 10 ? `0${num}` : num;
}

// Example usage with an array of time values
const timeArray = ["03:47:29", "01:47:16", "02:30:45"];
const result = sumTimes(timeArray);
console.log(result);