Baby movement

Hi ladies I'm 24w2d and I'm curious not freakinout but if I work 9 hrs a day how many times during my work period should I feel my baby move? It's just that when I'm working I'll feel her at times and at other times I don't. I honestly don't pay as much attention as I do when I'm off...should I write down the times and stuff to see if there's any irregularity? P.s. This is my first baby