Originally Posted by Tech211
You can't go too wrong following the instructions from Midwest, but the extended boil may not be neccessary. That kit already has amber dme and crystal 40. That will give you a decent amount of caramel flavor without a long boil.
It will have a caramel flavor, but by caramelizing more of the sugars with a longer boil, they become less fermentable. Then you get a slightly higher ending gravity which contributes to more mouthfeel, which is desirable in a Scottish ale. Either boil time would make a good beer though.