6-8 years total development time for a big game seems fair to me. Not even that long to be honest.
Big mainstream video game titles made by big teams take 6+ years on occasion so I would consider this timescale as normal and not crazy long when you scale both the medium to a VN and the team to very small/solo.
And yes, maybe, perhaps, possibly, it could be that just a liiiittle bit of attachment may be involved as well
![KEK :KEK: :KEK:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I do want to see the end and epilogue of Eternum though and am excited for whatever comes after. But there were earlier estimates of up to 20 updates and I would not have declined that possibility but it is what it is.