Isadora STD font HOw large can you make the font size?
This is a question you should ask in the appropriate product forum.
Moving this discussion to the Adobe Type forum.
Spkay if you are referring to http://store1.adobe.com/cfusion/store/html/index.cfm?store=OLS-US&event=displayFontPackage&code=1066 then it is an OpenType font and you can scale it as large as you wish. Any limitations will be due to the application you may be utilizing.