I think I have also done just 20 minutes of ATM and repeated it on my other leg for a 40 minute workout. The reason that it wasn't my favorite that when I was able to do the entire workout several times a week, I didn't see as much leg toning as I do in some of her other workouts. That's why I do Tonique. (Legs, hips, glutes).
So for legs, hips glutes my dream workout is Tonique Borm to Move 1.1, even if I stop at 60 minutes. It firms and tones my lower half unbelievably. It has much less arm balance work but your legs will be worked hard the entire time. And your butt, omg.
Ok for easier (IMO)
Euphoria - lower body emphasis, less arms, like an easier BTM 1.1 less than 45 minutes.
Sculpt 1&2, CardioSculpt 1&2 - each about 20 minutes, great toning, and you can just do 1 or more. You can go for a walk or run or swim and do just one and get great results. Not killer. I used to do all 4 for a 70 minute workout and got great great results. I didn't get her Cardio download. I do Tonique for toning. I also don't like a lot of impact. Running has less impact for me than her cardio.
San Sebastián 1 & 2 - for me, 1 is easier than 2. 1 has a leg emphasis and 2 has many mini handstands. I can't do as many mini handstands as her but what I do when I can't do them all is put my hands on the ground and do rear leg lifts. I still get great results. I also sometimes do a single leg floor touch with my other leg reaching and lifting back. I don't care if I get great results.
CardioMat - I love this one but not everyone does too. It's outdoors in a nature preserve. It's an earlier workout so not as hard but really effective. It goes back and forth standing to floorwork. I stop, usually, around 65 minutes. It gives me great results. No music though. Sometimes you can find it really cheap on Amazon or elsewhere. I think I paid $7.
Get Dirty- easier but has arm balance work in it.
Hamptons- 25 minutes. The first 12 minutes is really hard for me with the arm work but if I get through the first 12 minutes I'm home free. The second half is really good for legs and for 25 minutes, it gives me great results. Beware though, the first part is so hard for upper body,
Fem Fatale - I think workouts #1 and #3 are treasures. They are only 30-45 minutes long, not killer but so effective. I would sometimes do both in one session. It's workout 2.1 and 2.2 that are killer for me. Workouts 1& 3 are gems.
If you just did Fem Fatale 1 & 3 you could get great results. Or just CardioSculpts and Sculpts 1&2. Or the San Sebastiens or CardioMat. I'm not into torturing myself, just getting results. Plus my knees are more picky at my age. (54)
HTH
Casey