[bergesenha]

I find that coffee in a thermos can stay good for almost a whole work day. Coffee on the machine in some sort of “keep warm” mode goes rancid within 30 mins or so. I have a suspicion it’s some reaction with the oxygen in the air...

[chrisseaton]

Tea in a thermos unfortunately goes bad pretty much instantly - something about being sealed in there in its own steam I think. With milk in it it goes even worse.