Questions about the endings in Fallout 1

[Kal Sunrider]

I read Per's guide about what triggers the different endings in FO1, but there's something I'm not sure about. Some of the Mutant Invasion endings are triggered if you enter an area after a certain number of days; does that mean if you enter it the first time after that many days, or if you enter it at all after that many days? Ex: Necropolis gets invaded if you enter it after 110 days; is that if you enter for the first time after 110 days, or if you enter it at all after 110 days. If it's the latter, does that mean you can finish in the Necropolis before 110 days and then never enter it again after 110 days and still get the good ending for it?

 

[Per]

Some of the Mutant Invasion endings are triggered if you enter an area after a certain number of days; does that mean if you enter it the first time after that many days, or if you enter it at all after that many days?

The latter, otherwise it would have said "for the first time".

If it's the latter, does that mean you can finish in the Necropolis before 110 days and then never enter it again after 110 days and still get the good ending for it?

Yes.