Sounds very low to me. As others have said MIs take precedence over other standards / regs so check out the MIs for the extractor you want. BUT I seem to recall a min distance between hob and extractor of 650mm for elec and 750mm for gas and this was an accepted "standard" - can't remember where though so could be wrong .
The cupboard depth is only 35.5cm while the worktop depth is 63cm. This means the extractor does not stick out further than 35.5cm as it is sitting inside the bottom of the cupboard so not risk of me banging my head against exactly !
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