refresh page using jquery ajax

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ASP.NET

Ajax

jQuery

hi,
I have a web application where I am showing user comments on a page with its posting time. Since there are comments posted regularly so I need to update the comment posting time after every 1 minute. For this purpose I am using jquery ajax to update the time from db. My code is this:

 setInterval("UpdateTime()", 60000);


function UpdateTime() {
    var id=$('#hdID').val();
    $.ajax({
        type: "POST",
        url: "mypage.aspx/UpdateTime",
        data: "{'id':'" + id + "'}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(msg) {
            if (msg.d.length > 0) {
                obj = document.getElementById('feed_TimeStamp' + id);
                obj.innerHTML = msg.d;
                //$(obj).slideDown("slow");
            }
        },
        async: false,
        error: function(xhr, status, error) {
            //alert(xhr.statusText);
        }
    });
}

cs file:

[WebMethod]
public static string UpdateTime(string id)
{
    Comments comments = new Comments();
    string time = "";
    if (comments.LoadByPrimaryKey(Convert.ToInt32(id)))
        time = MyClass.GetTime(comments.CommentsDate);
    if (!(time.ToLower().Contains("sec") || time.ToLower().Contains("min")))
        time = "";
    return time;
}

But here my issue is after every 1 minute when this web Method is executed the whole webpage is hanged away until the ajax call is finished. I want to refresh the time without busing the page.