In California, executors generally aim to settle estates within one year but complexities can extend this timeline. Although there's no strict deadline under normal circumstances, quarterly reports might be required for long-term cases justifying why more time’s necessary for extraordinary situations potentially extending timelines even further upto final closure potentially stretching extensive durations depending on various involved factors-specific inherent complexities determining exact duration variability influenced situationally-driven extended resolution prerequisites necessitating longer-than-usual decision-scale calibrations accordingly adaptable reflecting requisite completion rhythms.