I am a female 53yrs old. I have 4mm kidney stone. How long does it take for recover? Do I need surgery?

Kidney stones. It is not going to dissolve, it may sit there or may move down and get flushed out in urine. At this size if does not cause any problem no intervention is required, but if you know the type of the stone, follow dietary plan or any medicine given by your doctor to slow down the growth or formation of new stone.