How fast can you grind up primogems?

I’m currently at really low primogems. Earlier today I finally decided to grind overworld chests for a bit, and got quite a few of them. I felt pretty decent, and went to the wish screen to see what I have… only to see a net increase of around 100 primogems, not even a full wish.

I want both Zhongli and hopefully a C1 Neuvillette (already have C0 but his C1 is one of his best constellations). I’m at relatively high pity (though a 50/50) so I think I got decent odds if I work hard enough. Only problem is that I don’t have much clue how to efficiently grind primogems. I recently spent ~5 hours grinding for primogems the day before the banners changed hoping to snag an Ororon, and I only turned up with a single 10 pull.

My question is how much primogems can you expect to turn out through efficient farming? For reference, I don’t have a lot of exploration done, and also have a lot of unfinished quests. I also am trying Imaginarium theatre and Abyss already to the extent of my abilities, but can’t finish them.