@Hostafan You could push one seat partly under, as far as the central bar, but not 2 seats because of the diagonal corner reinforcement. One seat each side gives a width of 1m35cm. Two seats go just slightly under the table edge and give a width 10cm shy of 2 metres. Measured with my trusty wooden metre sticks
The chairs are solid, definitely unlikely to blow away. My daughter, who built my sheepshed, has been pricing up timber for another project and thought the set was really good value when she totted up the total amount of wood needed.
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I could always leave 2 chairs in the garage until needed.
I live in west central Scotland - not where that photo is...