Coconaras are definitely great coals, but when I run out I just use the Holland QLs that I keep handy for just such an occasion. Three of those QLs lasts me about a good hour and a half with good enough shisha that doesn't burn too quickly (Social Smoke). I just use three 1/2 pieces of the QLs per session in a triangular shape and they work great. I normally don't even have to ash them, just wipe them off the bowl when they're through and light up another batch (after the shisha cools for a couple minutes of course). The other night, a bowl of Social Smoke with QLs lasted an entire 90 min movie and then some by about 10 minutes. It was the first time I was ever able to do that, never was able to do that with Hookah Hookah. Needless to say, I was pretty happy.