It's not fast - but you can tune what/when it scans

Just did a test, C drive with 40Gb of Windows + program installs, a default settings initial full scan on a reasonably good machine.

----------- SCAN SUMMARY -----------

Known viruses: 925205 Engine version: 0.97 Scanned directories: 17693 Scanned files: 99960 Infected files: 0

Data scanned: 15352.83 MB Data read: 15506.05 MB (ratio 0.99:1) Time: 2863.965 sec (47 m 43 s)