If you spy and your espionage level vs theirs is not great enough it says "unknown" for recent activity

If you spy and your espionage level vs theirs is great enough it will say the server time they were last active within x amount of hours (where x = your espionage level)


------
If you spy someone and your espionage level vs theirs is great enough to attain this information, but their last activity is beyond the range of X, it says "unknown"

it would be nice if this displayed last activity greater than X. Or some indication that normally you would of ascertained this information but their activity time cannot be displayed.

I agree, always 'unknown'. It would be nice if activity for last x hours, What he is researching or building or making defense and fleet. Anyone agree?

Its not always unknown, you must have high espionage level vs theirs to ever get that info.
Problem is say you're espionage 13, that means if you succeed you can see their activity within the last 13 hours.
If their last activity was 14hours ago, you have no idea of knowing, you are also not told that normally you would receive this information but that they were active outside your detection window

That's very rare