how long does heating oil last you?

heating oil

hi there,
was just wondering how long heating oil would last you all, i recently bought 500litres which cost £220.. my heating is on around 6/7 hours of every day which i dont think is excessive. and the oil only lasted 7 weeks. I can believe it, im always worrying about putting the heating on becasue its so expensive, but i keep thinking there may be a leak or that the deliveryman isnt giving the full 500l…Any ideas, thanks

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