Are you keeping this kick chart for you, or has an ob told you to do it that way? Like everyone else said, it usually is 10 per day.

That said, you know your baby best. If you've come to expect 20 in a few hours, then you'll keep expecting that. I suppose I'll be the same if I have an active bubba - any less than the usual movement and I'll freak out! With ianto, I wouldn't get scared if I hadn't felt much movement in one day - he wasn't much of a mover, and never hit ten a day.

Maybe try to find a medium between the "10 per day" norm and your "20 in a few hours" one?