How long can I keep veg warm for?

[5foot5]

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.

[FawnDrench]

Won't it tell you in your user manual re timings?
Or go online to see about your particular make of hostess trolley.

I would think anywhere up to 2 hours, but am definitely not an expert as the one my mum had was very last century!

Or - Could you microwave the veg - or some of it - when your guests are about ready to eat?