The larger of course take longer to light, here I use a conventional gas cartridge camping stove (butane 190g) which really is very simple. (Do not stack the charcoal on the small grid but simply to the "head" where the gas comes out, then kissed directly from the flame)
The whole then takes a good 5-6-7 minutes depending on how much one wants to leave by the glowing coal.
The only thing that bothers me is the one who must now and then turn to the cooled side came down directly to the foil in contact to exchange them for a glowing. The whole is also the case only during the first 20-25 minutes.
Moreover, it often happens that the ash which comes when turning down towards tobacco and accordingly leaves a taste. So if you smoke on the balcony / terrace, just shortly thereafter, and the ashes blow away.
mfg