Filter out realtime results which are >3 hours in the future

	$self->get_realtime;

	@{ $self->{results} }

	  = grep { ( $_->departure // $_->arrival ) >= $self->{datetime} }

	  @{ $self->{results} };

	@{ $self->{results} } = grep {

		my $d

		  = ( $_->departure // $_->arrival )

		  ->subtract_datetime( $self->{datetime} );

		not $d->is_negative and $d->in_units('hours') < 4

	} @{ $self->{results} };

	@{ $self->{results} }

	  = sort { $a->{datetime} <=> $b->{datetime} } @{ $self->{results} };