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In theory this is easy to work out watts = volts x amps, what you need to calculate is amps, so its amps = watts divided by volts, in your example amps drawn is therefore 32/12 = 2.66 amps, for 10 hrs therefore it is 26.6 amp hrs which would use roughly a quarter of a 110AHr battery... Thats the theory..

In practice, due to the nature of the equipment you intend to use I would suggest you fully charge your leisure battery, then use your equipment at home and see if it does indeed last as the theory only works given a fully charged perfect battery and warm ambient conditions, voltage loss in the caravan wiring etc etc