There is no given measure of meters in a city block.
The size of a city block has not been standardized by the likes of the ISO organization. There is no standard measure employed when designing new city blocks. The common denominator, if ever calculated, would be largely influenced by the ancient roads (as is width of the lanes) especially in such capitol cities as Rome, London and Madrid.
Since there is no standard definition, using a tool like Google Maps to roughly gauge the average length of blocks in a major city of interest may provide you with the information you are interested in.
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