Never.

It'll be something like a year for the dev to "finish" the game, and there's a LOT of content already.
You can transfer existing Save files over when a new build comes out. You don't even have to complete existing content for that. If a new version comes out before you complete all the existing stuff, transfer the Save over and it'll pick up where you left off. IIRC someone is still using a Save they started years ago. (Something like v0.6x?)
FYI, if you install the
optional Spicy (incest) & Gnomes (bestiality) mods you'll need to re-DL and re-install them when a new build comes out...sometimes there's new content the older mod versions won't have/support. Using Spicy & Gnomes is safe but any other mods are not, they regularly break the game. Same for manually editing the game. There are cheats built into the game that make edits unnecessary unless you want to be REALLY overpowered...