Avast Boot-time scan

[Sode no Shirayuki]

Hey, approximately 15 days ago, I decided to attempt a Boot-time scan with Avast.

Boot-time scan parameters:

Areas to scan: All harddisks, System drive

Heuristics sensitivity: Normal

PUPs: Checked

Unpack archive files: Checked

The scan reached 9 hours, then I decided to abort the scan. Is it unusual or common for Avast's Boot-time scan to take this long? Can I decrease the scan time to approximately the scan time of a Full system scan using the On-demand scanner? A Full-system scan on my computer takes slight more than 1 hour, iirc. It certainly does not take more than 2 hours.

In case anyone wonders, the scan was clean.   

[Atani]

That seems very abnormal.
My last boot-time scan took just over an hour or so, maybe less.
I dare say there's certainly no reason for it to last anywhere near that long unless you were doing like a scan of a very large computer network or something.

[Pondus]

How many GB do you have ?
How many archive files to unpack ?

[Sode no Shirayuki]

My C: disk had approximately 5-6/62 GB of available disk space at the time I performed the scan. 
My D: disk is a recovery partition with approximately 1/11 GB of available disk space.
I'm not sure how many archives there are to unpack nor do I know how to check.

[nyrb]

same thing happens to me!!

scheduel a boot time scan, and i let it run for hours and it never got above 0%

was stuck searching

C:.. Documents and settings/..../1/a/3xxxxxxxxxxxxxxx
C:.. Documents and settings/..../1/b/3xxxxxxxxxxxxxxx
C:.. Documents and settings/..../1/c/3xxxxxxxxxxxxxxx

when the alphabet letters would finish

C:.. Documents and settings/..../2/a/3xxxxxxxxxxxxxxx
C:.. Documents and settings/..../2/b/3xxxxxxxxxxxxxxx


get it? its like it was searching this never ending combination of letters and numbers from folders i couldnt find.. and never getting anyehere

what can i do?