Its 100g so probably enough to do a single cat probably the best part of a year if using every other day????
maybe actually a year or slightly longer as you don't need very much at all to get them going wiiilllllldddddd. I only use a 2 x pinches at time with my lot and they mental for ages.
Suppose it depends on how much you use it??? I'd probably say its about 20 - 30 times the qty of the kookamunga stuff you get at the pet store. Hard to say other than.... 100g