If your incrementals are taking that long, then it is not doing sector tracking and it is probably using Microsoft's volsnap.sys to take the initial snapshot. This may happen because our snapshot/sector tracking driver, stcvsm.sys, is not loaded. This generally happens for two reasons, a driver conflict, or the backup job was created and executed immediately after install, but before the reboot.
I would first delete the job, reboot and then recreate the job and see if this issue goes away. if it does not, then please send your log files to support@storagecraft.com. They can be found in c:\program files\storagecraft\shadowprotect\logs\
STC