Sending you should know is to get those coal very heavy as well - use> Therefore, either a Bunsen burner or Kohleanzünder (camping stove) !!
The firing time is 90 min, according to the packaging but mostly I have already stopped smoking and it therefore can not accurately confirm -.> In any case, Longer and Healthier especially as self-igniting coal !!
To compare Selbstentzündender coal, you no longer have here as far anrauchen the Shisha but requires 1-2 light trains and the thing smokes like a chimney (as it should be) !!
A little tip: the best skin equal to 2-3 per capita natural coals on the hookah it (depending on how large the head) then the heat is really spread on each (Air) hole and then brings in this sense, more power, Regarding the overall result !!
My conclusion: Apart from the fact that you do not Anbekommt and it requires eg a Bunsen burner without lighter, it is the price (and so on) really value and therefore strong buy recommendation !!