I am too. If it's faulty or there's something wrong with it you can still discuss it with Live Chat beyond the 30 days. And I've been buying from Amazon Warehouse for years. They don't just ignore you or say they can't help - they try to offer a solution. Obviously it depends on your reasons. But I even returned an unopened, Used - Like New, unwanted gift I had here (nappy changing bag) beyond 30 days as it turned out the mum-to-be bought a Silver Cross pram set which included one already. Amazon were absolutely fine about it.
I'm talking about returning an item. They only extend the return window around Christmas. Officially they give you 30 days. They have to supply the normal warranty as all retailers do. I'm sure in some cases they do exceptions depending on who you speak to for returns as well.
From experience and long term purchasing from Amazon Warehouse - not quite. I have had items longer than this that have stopped working or not been fit for purchase and I would say you probably have up to a year, depending what the item is and what condition you bought it in. You get the same Amazon Customer Service, in general, though sometimes you will get a Customer Service agent try to partially refund. So, just be persistent and talk to another.
It's always 30 days. It doesn't change.
I got my sister a very similar Russell Hobbs 20L/800W Microwave Used - Very Good for £11-odd about a year ago - makes a bit of a din in use (noisier than other microwaves, though it said so in reviews). It was in perfect nick, just the packaging was a bit dinged. Be aware 20L is teeny-tiny, so ensure you know your measurements. Nothing wrong with Amazon Warehouse at all, but be prepared for some disappointments on the way.