o.O I did less than that for my L.Mus
Haha that was only starting from 3-4 months before my exam when I was highly screwed, a year before my exam I'd only do an hour a day 
Yeah, I'm with ninwa, I only did about an hour a day up till about two weeks before, then my practice time ballooned out to about 3 hours (a lot for me

)
Actually, I found that not practising the three days before really helped, I didn't burn out like a lot of people do from too much last-minute practice.
Don't ever play gaythoveen, playing his shit music will only make you more stressed 
Very funny, a lot of his music is actually really nice to listen to (funny that!
)
Play Chopin, Debussy and Rach instead 
I don't play piano

But yes, no Beethoven violin for me, I'm playing lots of Romantic period music
