scan length

I am running scan. Have 1200 megabytes installed (200 meg and 1 terrabyte drives). Am currently running scan. Has done 2 percent in 2 hours! The program has never been slow like this. Can you help me? Thanks.

You don’t give any information on the avast version being used, the type of scan you are doing (if it is default settings or changes made) and some system specification info, OS, CPU, RAM, etc.