/// <summary>
        /// Renders the timing details of the Nested Logical Context item and appends it to the specified <see cref="StringBuilder" />.
        /// </summary>
        /// <param name="builder">The <see cref="StringBuilder"/> to append the rendered data to.</param>
        /// <param name="logEvent">Logging event.</param>
        protected override void Append(StringBuilder builder, LogEventInfo logEvent)
        {
            TimeSpan?scopeDuration = CurrentScope ? ScopeContext.PeekInnerNestedDuration() : ScopeContext.PeekOuterNestedDuration();

            if (scopeDuration.HasValue)
            {
                if (scopeDuration.Value < TimeSpan.Zero)
                {
                    scopeDuration = TimeSpan.Zero;
                }

                if (StartTime)
                {
                    var formatProvider = GetFormatProvider(logEvent, null);
                    var scopeBegin     = Time.TimeSource.Current.Time.Subtract(scopeDuration.Value);
                    builder.Append(scopeBegin.ToString(Format, formatProvider));
                }
                else
                {
#if !NET35
                    var formatProvider = GetFormatProvider(logEvent, null);
                    builder.Append(scopeDuration.Value.ToString(Format, formatProvider));
#else
                    builder.Append(scopeDuration.Value.ToString());
#endif
                }
            }
        }