That and at most they run for 15-min on a fill up. But this is normally more then enough. If not just pour some more alcohol in it and keep going. Alcohol flames are hard to see in daylight, so make sure it’s out before you refill it.
Last summer I recall reading that a Boy Scout was killed when trying to refill an alcohol stove that hadn't been allowed to cool down enough (or may have still been lit). Apparently the flame caused the alcohol container to ignite resulting in lethal burns to the boy. Very sad.
Be careful when refilling!
I recently purchased a White Box Stove and the little starter kit from freezerbagcooking.com. Haven't had a chance to use it yet. Soon I hope.