When do spiritually realized beings like Sai Baba choose to take birth or leave their bodies?

According to the teachings in Chapter 43, spiritually perfected beings operate outside the normal compulsions of birth and death. The text explains that they 'incarnate by their own will' with the 'sole desire for the welfare of devotees.' The timing of their arrival and departure is not a random event but a deliberate act. It is mentioned that Sai Samarth could 'die at will' and left His body only after 'the task for the devotees is over.' Therefore, the chronology of their physical presence is dictated by their own volition in service of their mission to protect and guide devotees.