What do you think of AVIRA anti-virus? It takes a long time to scan!
Avira AntiVir PersonalEdition Classic? - It's pretty solid and holds up well against competition. Especially for a free product!
Also, scan time will depend on a number of different variables. I do not mind long scans as long as 1- they finish, 2- they are thorough and 3- they catch what they are supposed to catch! Frankly, I am more concerned with "real-time" scanning and an AV product not letting baddies onto my compy in the first place. .. .
--- You'll find that the free options in my linky are much less bloated than their commercial counterparts and use fewer system resources.
However, some of the better "security suites" will attempt to offer rootkit protection, and the like - this might be a factor you'd want to consider as well.
Cheers

PP
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