@model TimeSpan?

@{
    Layout = "_FieldLayout.cshtml";

    var ts = Model ?? TimeSpan.FromMinutes(10);
}

@Html.TextBoxFor(m => m, 
    "hh\\:mm", 
    new
    {
        @Value = ts.ToString("hh\\:mm"),
        @class="form-control timepicker", 
        data_provide="timepicker", 
        data_minute_step="5", 
        data_show_meridian="false",
        data_disable_focus="true", 
        data_template = "dropdown", 
        data_default_time="value"
    })