I am trying to cook a few mor healthy meals and want to know, after cooking, how long can a stew/casserole keep - as I want to take it to work through the week too -
can it be frozen? if so how long for?
without freezing, how long can it keep - and is it safe to re-heat in microwave?
It's fine to freeze. It's safe to heat in the micro-wave. In my experience stew does not keep well fresh, although it's usually nicer on day two. I would stick in the freezer after that.
Stews can be refrigerated (at no higher than 5 degrees) for up to 3 days but preferably I prefer to freeze in a suitable plastic bag or container when it will be fine for up to 6 months and probably longer although it's wise not to leave things in a freezer for too long as they can suffer freezer burn and the quality will deteriorate.