The higher the resolution you use the longer it takes to scan each one so if you have hundreds to do you could end up married to the scanner. Many scanners also give a scan that is darker than the original photo so you have to put them through photoshop or similar to brighten them up . At the same time you can erase lamposts that are growing out the roof of the cab if they are against a plain sky and look stupid.
I gave up scanning fotos, just take a digital foto of the print, on macro if you have to but you have to be careful of shaddows. Its quick and will give just as good as a result if not better as you can select the resolution that you require on the camera.