Hi Paulab.

No offence but if you are asking these questions about elctricity then it is probably better not to attempt this yourself!!!  If you have such a short time to wait for electricity to be connected , then it is not wortwhile looking at batteries or inverters (they will cost near enough £1500-00-depending on what you want) Nigel is right, you have to look at what you are running, fridge-ok, freezer-ok - hairdrier-(NOTE:NOT PLURAL ) -OK Air-Con - OK . Try and run alll these items together , probably not. Having been in you position it is the most cost effective and easiest to have the generator run a few hours during the evening  just possibly for a bit of light and maybe the aircon and water pump. You will struggle with the fridge as that needs to really run  full days to compensate for opening and closing unless you have a chest freezer, that could survive on probably 4 hours of running, besides the weather is good and one doesn't really need electric so badly this time of year!!

Good luck