Welcome to the Change (as it has been known). If you do a bit more googling you'll learn that it's all totally bespoke or, as my midwife used to say, 'every baby's different'.
My advice is 'cycles' are all over the place - they're not really even cycles.
Compared to some others, I've had an easy ride but telling you my cycles for the previous 14 years (if I could remember them) would not give you much insight into your meno journey. When mine started I didn't even realise because I was in my late 30s and even through my 40s, I never attributed my ongoing, unrelenting cotton-mouth to meno but I now realise it was.
Here are some traveling notes but they are not any guideline.
For me, there was no change to the average number of days in my cycle but some months just didn't happen - i.e. if my period was due on 3 March and didn't happen it might appear on approx. 3 April or 3 May. And although the start date/day might be similar, the length of bleed could vary: some months it was a steady drip for 5/6 days (normal) but others it was a somewhat scary deluge of 3 or fewer, soaking through 'super plus' tampons and requiring frequent changes. These 3 day quickies were very much a variation - known but unexpected.
Although there is much more info than in previous decades, it's all still very personal depending on your particulars. GPs need bloodwork to determine correct HRT.
If anything (flow/frequency/anxiety/insomnia or more) preventing you from enjoying life, do go to your GP and go loudly; if you persist, they can sort it.