I have just cooked a stew, but there is tonnes left so I want to let my
flatmates have it when they return from holiday tomorrow (in 24 hours
time). I also want it to be ready-to-eat when they get home.

I am wondering what the best procedure is. Should I put it in the slow
cooker now, and keep it warm until they return, or should I cool it in
the fridge now, and then blast it in the microwave tomorrow before
putting it in the slow cooker to keep hot?

Many thanks in advance.