how long is a pot of coffee good for on the warmer?!
Answers:
It starts to taste awful after half an hour or so.
Many years ago I heard about cancer risks from stale coffee. Don't know the details though.
Coffee starts to acidify in 20 minutes. After 30 minutes, fresh coffee is much better. A one or two cup coffee maker sounds right for you. So last limit could be 30 minutes.
http://keurigmachines.com
Thirty minutes, max.
For my taste any more than an hour and it starts tasting bitter. I shut it off and warm the leftovers in a mug in the microwave.