Yes, everything takes time and you need the proper computer to do the job.... Scan time: approx 1 to 2 minutes per color neg depending on resolution...a lot less for B & W. File sizes: yes, they get big as you increase resolution...but, get used to it...it's not much different than manipulating that RAW of TIFF file out of your 20D or D70 cameras...or, heaven forbid a D2X RAW file.... Additional time:..don't forget, the bulk of your time will not be spent scanning but in image enhancement...color correction, cloning out dust...etc...

In youth, we learn....with age, we understand.