Yes they go a bit soft after 1-2 days and the chocolate gets a white 'bloom' on it from the cocoa butter. I made some for a party at Hallowe'en and put the rest in a Lock and Lock airtight tub but after 2 days I binned them.
Don't know if they last longer with cooking chocolate ,I use Sainsb or Tesco own brand eating chocolate.
I'd love to eat them as soon as I make them but I need to make them for DS to take into his school for his birthday and I don't fancy the wrath of DS and his classmates when I tell them I ate all their cakes!
So if I make them on Sunday evening they'll be OK at 3pm on Monday? Assuming DS's teacher doesn't eat them for her lunch...