Varies by unit and unit strength, but in my artillery unit my battery had 150 people roughly, four firing batteries in the battalion.
150 x 4 = 600
That's not counting the motor sections, ammo sections, and other support personnel.
(And maybe forgetting the headquarters 'battery'..)
Do you have any idea how ... comforting ... it is to know I can bop in here, ask a question out of left field, and know the answer I'll get will be detailed and marvelous?
I don't think I've said lately how much I appreciate this place, and you people!