How long will 200mb of data last on my iphone?

i should be getting an iphone 3GS friday and i can only afford the 200mb data plan, although i might upgrade to the 2GB plan at a later time.

i'm usually only at school and home. i have wifi at home & i'm hoping that i can get wifi at school because they don't give you a password even though the wifi is locked...you take your laptop to them & they put in a code in the command prompt. so i'm not 100% sure if i could get wifi on my phone there.

but would i go over my data plan if i check out 2-3 webpages & go on facebook & twitter each day? thats all i would do while i'm at school, probably.

thanks!!
 
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