Sforno on Numbers 9:23/ספורנו על במדבר ט׳:כ״ג

1על פי ה' יחנו, even when the encampment was so short-lived and the time for the to arrange their affairs was so short.

2ועל פי ה' יסעו, when the dismantling in advance of the next journey would be more time consuming seeing that they had been in the same location for a long time, they still hastened and packed up to follow the cloud.