Size of files - airial images

[Christo]

If you take pictures every 4 seconds during a flight
at 1 inch resolution
flying at 130m
with an overlap of 60%
fly for 18-20 minute
covering 600 acres

1. How many images will there be?
2. What size will the individual images be?

[airmap3d]

Some more information is required to be able to answer your questions...

What average speed will the aircraft be flying at?

Is that 60% overlap in-flight and side?

Which camera and what lens are you using?

With that information it would be possible to at least come up with some estimates.