@selectedTime?.ToString("F")

<TelerikTimePicker Min="@Min" Max="@Max" Format="hh:mm:ss tt" 
                   Value="@selectedTime" ValueChanged="@( (DateTime? v) => ValueChangedHandler(v) )">
</TelerikTimePicker>

@code {
    public DateTime Min = new DateTime(1900, 1, 1, 10, 0, 0);
    public DateTime Max = new DateTime(1900, 1, 1, 20, 0, 0);
    public DateTime? selectedTime { get; set; } = new DateTime(1900, 1, 1, 12, 0, 0);

    void ValueChangedHandler(DateTime? updatedTime)
    {
        selectedTime = new DateTime(
                selectedTime.Value.Year,
                selectedTime.Value.Month,
                selectedTime.Value.Day,
                updatedTime.Value.Hour,
                updatedTime.Value.Minute,
                updatedTime.Value.Second
            );
    }
}