/// <summary>
/// Only for tests!
/// </summary>
/// <returns>10 mins left interval for <see cref="_10MinLeftTimer"/>.</returns>
public double Get10MinsLeftInterval()
{
var endDate = _grbMap.NextCloseDate(_timeService.UtcNow.AddMinutes(10));
var left10Mins = endDate.Subtract(TimeSpan.FromMinutes(10));
return(left10Mins.Subtract(_timeService.UtcNow).TotalMilliseconds);
}