Depends on the position of the burners on the hob - we had this issue with our kitchen.
As it turns out (phew) the spacing of the burners on the hob were within the 60cm of the extractor by the required amount (can't remember what it is!) so we were OK with a 60cm extractor.
If it doesn't mess your plans up too much a 70cm extractor would be preferable but if it's going to ruin the design you may be OK with a 60cm depending on the spacing of the burners...
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