You can go all the way up to 999 point (13.875 Inches high) if you want.
To save yourself the trouble of typing in numbers to change the point size, if you highlight the text and use the "Control + [" key combination (without the quotes) the text size will increase by one point per key press. Use the "Control + ]" key combination (without the quotes) to decrease by one point per key press.
This is usefull if you are trying to fit some text exactly into a particular space.
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