Question about the length of the Zodiac and Anima weapon quests

Hello, while I am trying to finally finish my Pagos weapon and finally start with Eureka Pyros, I do think about catching up and finishing some quests for those older Relic weapons from AR and HV.

Zodiac: Currently iLevel 100, doing the Trials of the Braves, 4 tomes left to do
Anima: Currently iLevel 230, Filling up my Anima Glass, 186/240

I look up what shall follow these quests, and ... yeah I do come to the conclusion that I'm closer to completing my Anima weapon than the Zodiac one, but that's besides the point. I counted how many Tomestones of Poetics I would need to collect to finish all of these, and it's a bit crazy.

I really start regretting that I kept spending the tomes on junk, back when I was ranking up all the Beasttribe quests, and they were filling up all the time.

I think about starting to do Daily 50/60 Dungeon Roulettes to get at least a 100 of these daily, but I do really question how long I'd need to finish all of these. I start to feel kind of crazy for wanting to invest this much time into this old, from the very beginning, optional content.

I guess I just want to know if this will really take me forever to complete at this very pace.

It will take you forever, and cost you an arm and a leg.

The amount of Tomestones needed is likely to be the least of your problems. (But if you do need them: Daily MSQ roulette will give you 500 Poetics per day.)
Most of the items you need can be obtained by other means than Tomestones. But either way, prepare for grinding. And more grinding.

Poetics are stupidly easy to get these days. Doing a couple duties will have you nearly overflowing with them. But the total required tomes for those weapons isn't so bad as long as you're not trying to cram them all into a single week or something. It's a grind, but it's only really noticeable if you're rushing. Just do them alongside whatever else you're doing. Speeding through content will likely make you feel disappointed once you're done and it wouldn't seem as rewarding if you strain yourself.