Your question was not clear as to what you are thinking is too much movement in 1 hour.  The general rule is at least 10 movements, or more, counted in 1 hour.  At 29 weeks, your baby is about half ­­the size of birth weight; thus, there is still a bit of room to twist and turn, to move about quite a lot.  Depending on your activity or resting state and what you have eaten, your baby may be over stimulated and seem overly active.  From here on, your baby will be getting larger and stronger with every day.  It may feel like there is a soccer game going on in there at times.  However, you should be noticing sleeping states as well.

If you are experiencing constant activity with no resting periods, you should definitely contact your obstetrician to determine whether or not this is a sign of a problem, or perhaps that you are carrying multiples.  Many years ago, when I was pregnant, I was very concerned by all the weight I gained, all the food I had to consume, and all the activity going on in my belly.  Since this was my first pregnancy, I was not sure what was "normal" and, yet, I believed there was more than one baby in there.  My doctors kept telling me I was having a very large, healthy boy ... I had twin daughters.  In the last trimester, my abdomen looked like something from "Alien," moving lumps and bumps all over the place simultaneously.  I just couldn't imagine what the big baby boy was doing to make all those punches and kicks happen at the same time.  My doctor was very surprised at delivery; I got to say, "I told you I was having more than one." 

Since this is your second pregnancy, you know your pregnant body.  Just remember that not every pregnancy is exactly the same.  This difference in activity is probably normal, but is well worth checking out with your OB, if for no other reason than to put your mind at ease.