Charge Q coulombs stored on a capacitance of C farads is given by:
Q = CV
where V is the potential difference between the plates.
So the short answer is, any amount of charge you want, providing the insulating dielectric between the plates can withstand the necessary voltage between the plates without breaking down.
I suspect that you are not telling us everything here :)
Why did I just think of a very old movie called "This Island Earth"?
What amount of charge can be placed on a capacitor if the area of each plate is 5.5 cm2 ?
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