I have a large that I use in my 4 man and lbo. No complaints. Part of the fun is keeping it fed since you’re not really doing anything else when in the tent and helps with boredom. Burn times are highly subjective. In my areas, I’ve used pine, cedar, aspen, and willow, none of which are great. I hesitate to say how long a hot filled stove will last but in the best of conditions it’s less than an hour, usually like 30 min. When feeding little stuff it’s less than that. Wood prep is easy so I don’t worry much about feeding it, and you are not using it for nighttime warmth when sleeping, that’s what your bag/pad combo is for. I use a small uturn in my silex now.