Honestly, I have receive a different guideline for "how many kicks/how often" from each of the doctors and midwives I have seen since my first was born 11 years ago
The one advice that really made sense to me, is to just pay attention and notice is there is a dramatic decrease in the kicks and activities that your particular baby usually has. Why? Because some babies are very melow and will only move a little. Others will kick all the time.
Having a glass of OJ and waiting a bit always does the trick for me. ALso, if I am having a busy day, the baby slows down, I think because is being rocked to sleep with all the movement. So sitting down and waiting a bit also usually gets the baby going. Oh, and playing a little sound close to the tummy.
Later in the pregnancy the movements change because the baby runs out of space, but they are still there.
If you want to keep a kick count and have an Iphone, a couple of my friends have said great things about the Kick Count apps they have.