double next_event_model = model->next_occuring_event(NOW);
if ((time_delta < 0.0 || next_event_model < time_delta) && next_event_model >= 0.0)
time_delta = next_event_model;
double next_event_model = model->next_occuring_event(NOW);
if ((time_delta < 0.0 || next_event_model < time_delta) && next_event_model >= 0.0)
time_delta = next_event_model;