Transition from shorter, but regular cycles to menopause?

42F. My cycles are pretty regular and have always been so but they have become noticeably shorter in the span of last 2 years. They went from 26-28 days to 23-26 days. For those who went through menopause, how long did it the transition from shorter, but regular cycles to fully menopausal take?

My mom surgically entered meno at 43 so I don’t really know what to expect. Her other sisters who naturally entered meno were around 54-55.
But I had a laparoscopic endometriosis surgery 6 years ago. Luckily could conceive my 2nd child without any problems immediately after surgery but am wondering if it’s going to affect my timeline.
Thanks in advance for your answers!