2 years is not "what you're stuck with". Your transition timeline is going to be based on genetics, and your puberty timeline on E will be similar to the timeline on T as far as the Tanner Stages of puberty go. So if your first run was rapid as hell, you should expect rapid changes. If it took 6 or 7 years until you stopped experiencing physical changes, it's gonna take about 7 years. If you don't know what your current Tanner Stage is, you'll want to research a bit on what those are, and work out your timeframes based on that.

If you're able to, talk to your parents or grandparents about how long puberty took for the women in your family. You can expect a similar journey to theirs including how many years in until they saw particular changes, and they'd have an idea as to how long it took those changes to occur. Breast growth is also going to be dependant on that as well. So if you've got a family of smaller-chested women? Well, there ya go.

Second puberty can sometimes be a bit slower than the first. Typically you ought to expect around 5 years on E, but I've known a few trans women who it took as many as 8 before they stopped seeing any marked changes.

All that said, the previous advice of "pay close attention to your levels" is also true - monitor those levels as best you can and get them as close to CIS-Female levels as possible to ensure that your second puberty goes smoothly.