How long does an ovarian cyst removal operation take through keyhole surgery? and how likely are risks?

Depends: This depends on many factors including your body habitus, the size and consistency of the mass, skill of the surgeon etc. Typically if it is straightforward then it may be as short as 15 minutes. Add anesthesia time and setup and maybe it becomes 30 minutes from the time you go in, to the time you go out, of the or. Complications are not very common if it is routine.