Under field conditions, a saturated clay layer with a depth of $H=3m$ resting on a non$-$permeable rock

$($one$-$way drainage$)$ requires $270$ days to complete $70\%$ of its primary consolidation. How long $($in

minutes$)$ will it take for a sample of the same clay with a height of $H=25mm$ to achieve the same $70\%$

degree of consolidation under oedometer testing $($laboratory$)$ conditions?