This fact sheet from the transgender health program at Vancouver Coastal Health may be of use:
See the section "What Changes Can I Expect, and How Soon? (Benefits)"
One of the things it says is: "The degree and rate of change depends on factors that are different for every person, including your age, the number of hormone receptors in your body, and how sensitive your body is to the medication. There is no way of knowing how your body will respond before you start hormones."
It also goes into further detail.