For me, the changes happened really gradually, and some changes didn't happen at all (which is normal, because it's not the same for everyone, not even cis women.) It took around 2 years before I started noticing any changes, and around 4 before I stopped noticing any more changes. It can vary a lot though.

It's also worth noting even once you've experienced all the changes, it won't feel the same every time. For instance, for me, it's only a full body experience if it's a good one. Otherwise it doesn't feel much different in nature from a guy's orgasm. It does definitely last longer usually though. Usually around 15 seconds, but it can go up to... well, actually, I've never felt the need to break out a stop watch.

There's some things that for me never changed though. For instance, it doesn't take any longer to build up, and I almost never can have multiple in a row. Although I'm still responsive to stimulation, it just doesn't go anywhere. On very rare occasions I've had consecutive ones, but it's been that way since even before I transitioned.

Also, I've seen a lot of claims that female orgasms are more intense than male orgasms. For me at least, that is absolutely not the case. They feel different, but intensity wise it's exactly the same. I do react more physically, but not because it feels better, rather just because estrogen did that to me for some reason.

I think honestly the line between "male" and "female" orgasm are a lot blurrier than people think and it's not really a useful way to think about it. Not everyone will even experience changes to their orgasms and that's not because there's something wrong, it's just because there's so much natural variance that many women just naturally experience what is often called a "male" orgasm.

I've seen a lot of trans women get really disappointed thinking something must be wrong because they haven't achieved the fabled "female orgasm." Just know that that's a very idealized version of a female orgasm that not even most cis women, in my experience, meet. It's completely normal for some things to change but not others, or even on occasion for almost nothing to change at all.