 This observation allows us to quantify the time needed to "switch off " the country mobility (one week) and the time required to bring the net reproduction number below  1 (one week).
<meaning-changed>  This observation allows us to quantify the time needed to "switch off " the country mobility (one week) and the time required to bring the net reproduction number below  1 (one week).
 This observation allows us to quantify the time needed to "switch off " the country mobility (one week) and the time required to bring the net reproduction number below the critical threshold of 1 (one week).