How much standing do I lose on aborting missions? The ones that don't say "aborting will cause standings loss with the faction"? Or is it just 0 so I don't need to worry about it?

Why am I asking this?
I'm trying to do a mission that's kind of too stupid so I have to constantly abort & retry it so that's why.

Again mission DOES NOT say you will lose standing points on failing/aborting

Missions have to specifically make you lose faction on aborting, so it depends on the mission itself.

Missions that don't specifically say they'll reduce your standings by Abort are unlikely to have any negative impact.

I say "unlikely", because I can't be 100% sure, due to the number of PCC missions in production. But, generally, the standard is for the user to be told in-advance of any serious ramifications, and be given a choice.

Trade Guild missions do make you lose standing if you abort them or say you can't do it after taking the mission. And that includes losing standing with Corvus. And there's no warning on those. The loss is minor, only half or 1 standing point in most cases.