I noticed that in NASA world view web site it's take some time to get per day world wide coverage.
I made some calculations:
- The source is Aqua & Terra satellites
- Both have orbital period roughly 100 min
- NASA SW image processing delay is 3h
- Capture possible only when it's day time on respective earth part
The only question is what is the scanning footprint? Usually it's almost "180 degrees". But maybe it's significant smaller due to requirements of high resolution imagery? Because if it's "regular" 180 degrees it should be faster.