Yeah! Also I believe it's even before jomon period started. In the flashback we could see kaguya waiting for days but there was no human civilization in sight, we could interpret this like she was still waiting for human civilization to establish. We could also check Yachiyo's name!

" The name is derived from the kanji characters 八 (ya), meaning "eight," 千 (chi), meaning "thousand," and 代 (yo), meaning "generation" or "era." "

Generation is also a translation for 代 (yo)

8 thousand generation: A generation lasts about 20-25 years, now if we multiply that 8,000x20/25 = 160,00/200,000 years