Can't imagine why it would take that long, but when you install it you are offered a choice of the free version or a trial of the paid version. Selecting the trial will install the engine which runs in background and checks each file access. Installing the free version (which is what I recommend) just installs the on-demand scanner.
Hi Carlton,
It's been in the lower 40s by day, and the lower 30s by night, but thankfully today it's only 34. Humidity is very high though, so feels much hotter.