1 Hectare is 2.5 acres so a 2 Hectare site is only 5 acres not 6.
1 Hectare is exactly 10,000 m2 - the same as a full size football pitch.

On the matter of Olive groves:
In some parts of the Meditereanean area (parts of Greece and Italy for example), olive trees are spaced so closely that the trees almost touch and are hardly pruned. Whilst I understand the need for pruning, I don't understand why do the Spanish grow them so far apart with similar climates and rainfall to those other areas? Surely this reduces the amount of crops one can expect?  Is it just a cultural thing or is there a valid reason? I was thinking of planting more olives in between existing trees to close the paces up and increase yields.

hope someone can give a valid reason,
John.