Whether for two days or a month or a year, while the cloud remained over the Tabernacle, Bnei-Yisrael remained camped and would not set out. But when it would lift, they would set out.
Whenever the cloud lifted up from above the Tent, then Bnei-Yisrael would set out, and at the place where the cloud settled, there Bnei-Yisrael would encamp.
So Moses, Aaron and the entire community of Bnei-Yisrael did so with the Levites. All that Adonai had commanded Moses regarding the Levites, so Bnei-Yisrael did to them.
At times the cloud remained only from evening until morning. When the cloud would lift, they would set out. Whether by day or by night, when the cloud lifted, they would set out.