A while? Two minutes maybe?
I think the point of the handout was that leaving the sandwich in the refrigerator overnight means that it’ll warm up gradually over a few hours, as opposed to making the sandwich in the morning when the ingredients warm up as the sandwich is prepared. I dunno, it made sense at the time.
Some people* don’t refrigerate bread at all, so chilling the sandwich after making it would definitely have an impact.
*(normal ones)
Hmm, I may have to give that a try.
I don’t keep the loaf in the fridge, but I will put a sandwich in there.
[ASIDE]I started 1st grade in California in 1954. Nothing evokes elementary school to me like the lunchtime aroma of baloney and bananas as all those room-temp lunch boxes are opened… [/ASIDE]