How long does a full system scan take?

I bought this brand new computer almost 4 months ago. Thought I had a virus scan on it but obviously didnt. I got a Trojan virus. Bought Norton 360 v 5.0 and ran the full system scan. It has been running for over 24 hrs. Its moving....says it has deleted over 7 million Windows temp files...yes I said MILLION files so far. Is this normal? 

I bought this brand new computer almost 4 months ago. Thought I had a virus scan on it but obviously didnt. I got a Trojan virus. Bought Norton 360 v 5.0 and ran the full system scan. It has been running for over 24 hrs. Its moving....says it has deleted over 7 million Windows temp files...yes I said MILLION files so far. Is this normal?