Simon says you should get about 20 firings from the gas bottle depending on the duration and number of pots you are firing.
Although the kiln in the video was used for Raku (not something you should try in homeschooling - it is too toxic and dangerous to do yourself), I think it would work just as well for firing small clay projects at home. Fire it up until it starts to glow red inside, then switch off the burner and let it cool as slowly as possible. Remember that it will get very hot, so stand it on a fire-retardant surface.
Too much for you? Check out the other options for firing pottery:
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