I am having family round for a pre-Christmas meal. Doing a traditional roast and veg meal. The meat will be cooked and be happy wrapped in foil to keep warm I think but I wonder, if I cook the veg a bit ahead how long can I keep them warm in one of those electric hostess things? I have one but have hardly ever used it. Normally I time things to be ready when I want them but some of the guests are travelling a fair distance so we don't know exactly when they will arrive and want to wait until they get here before we eat.