I LOVE Jillian's program. LOVE. I had a baby 5 months ago and once he was 2 months old, I started 30DS. It was the perfect length that I could do it while my baby was napping. But yeah, I would only do it once a day. It took me 2 months to complete 30 days since we all got sick and I had to go to my grandma's funeral. But after 30 workouts I saw huge changes in my body. I thought I'd have a a droopy, loose tummy forever because I never tightened up after my my first baby, but my tummy is nice and tight now. I have some tone in my arms and legs. I haven't been this physically fit since high school.
I've been a lazy bum the past 2 weeks, but I'll be getting back into it tonight.
Level 1 was not bad at all. I heard it was terrible from others, but I didn't think it was that difficult. It was still a challenge and I could feel the burn, but people had been telling me they couldn't walk the next day. I had some tightness and soreness in my arms the first couple days, but it wasn't terrible.
Level 2 is a serious step up from Level 1. I am still on Level 2.

haha! Maybe in a couple weeks I will finally go up to Level 3. Even my hubby (who does a lot of heavy lifting at work) thinks level 2 is difficult and was grunting louder than me. lol
That's the great thing about 30DS... you just move up when you feel ready. You do NOT have to get through all 3 levels in 30 days.
2 weeks postpartum I weighed 155. I started watching what I was eating even before I started working out and was at 146 on Day 1 of 30DS. By Day 30 I had lost another 10 lbs (I only expected to lose 5 lbs.) and was at my wedding day weight. I'm still wider than I was then though since my hips and ribs expanded from pregnancies.
Inches lost by Day 30:
Bust: -1.5"
Band: -0.5"
Waist:
-3.5"
Hips: -2"
Arm: -0.5"
Thigh: -2.25"
Most days, I tried to eat between 1300 and 1500 calories. It was hard, but sooooooo so worth it. I hated my body after I had my first baby and I didn't want to feel that way after my second, so I was really determined.... and I desperately wanted to ditch the maternity pants. I hate those things. lol