There’s a lot of lag time between evacuee flights. Must be each country is using one or two planes and they want to give the fumigation a few days to soak into the upholstery. Sort of invalidates the virus only lives a short time on dry surfaces.
part is CCP - they’re being little brats. about when and who can fly in. But I think you’re right - they’re having to do the decon thing and of course the maintenance safety checks in between.