<RadzenStack Orientation="Orientation.Horizontal" JustifyContent="JustifyContent.Center" AlignItems="AlignItems.Center" Gap="0.5rem" class="rz-p-12">
    <RadzenLabel Text="Select Time Span" Component="RadzenTimeSpanPickerChangeEvent"/>
    <RadzenTimeSpanPicker Value="@value" Change="@(args => OnChange(args))" Name="RadzenTimeSpanPickerChangeEvent" />
</RadzenStack>

@code {
    TimeSpan? value;

    void OnChange(TimeSpan? newValue)
    {
        value = newValue;
    }
}