Depends on your age and the dosage and a lot of other things that are very variable.
For me, I got into a B-cup in about 6 months and some softening to the skin, thinning of the nails (which I didn't like as I was still working as a mechanic) and I started to cry at the slightest provocation over the silliest of notions.
My migraines stopped in their tracks, which was the primary reason for my HRT from an endocrinologist in LA.
After those original 6 months, I was off the hormones (Premarin) and went on about my life, minus-migraines, which have NEVER returned, and went along fine for a bunch of years before taking Progynova for osteoporosis and BPH.
I now have the prostate of a teenager, the osteoporosis is unrepaired but not getting any worse and I am a full C-cup with some female fat on the butt and hips. Secondary body hair is minimal now and shaving of the legs and chest are not necessary but once a week at worst.
Your results will prolly vary a lot and I bet there is no "typical" results for anyone.
