Haven't done one, Ginger beer would be as it's basically ready straight out of the can, fermentation time really only determines ABV content. You could throw on a GB for 4-7 days and probably get around 3-4% ABV depending on SG and FG.
BTW the ESB kits aren't available everywhere, you may have to ring around a bit but they are worth the money, if you calculate the cost of a standard 1.7k kit plus dex or DME and hops and a decent yeast there is not much price difference and IMHO they probably produce a more standard output as with less variables there is less margin for error. Same with the liquid worts for that matter, just add water and pitch the yeast, cant go wrong if everything else is clean.