How long aprox will a stand alone car battery last if used only for charging Mobile Phones?

the situtation is we are going on a boy scout camp next week and we are not allowed generaters on site so the solution we have got instead is a stand alone car battery connected to an inverter. can anybody tell me how long aprox would it last charging upto 10 mobile phones in 1 go

Depends on the size (amp hours etc) of the car battery, but I would say a week.

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