Could explain it away as how 'Fresh' the eggs are-
The long gestation period of Kane could a) Be the decade/thousands of years the Derelict was dormant making the payload a little sleepy in its cycle b) Ash & Dallas try and remove it, facehugger was just trying to make sure job done.
Besides Kane is busted within an hour of waking up, Ash if you look closely is expecting it to happen any moment so...
Hadley's Hope, no proof that lady weren't caught 20 minutes before the Marines turned up
Alien 3 was pretty quick, Ripley's was a Queen so nothing broken(Yet) there, a week sounds cool
In Covenant, although not Xenos, the Neomorphs were bourne within two hours max but also ditto Oram & Lope
The source of contaminant was 1st generation from black goo so All fresh
More to it than the creatures I reckon, host's metabolism and conditions could very well play a part, therefore think it's ok to give slack here if you choose to think about it rather than being driven by the franchise sequence