You are correct. There are three linear timelines: Yennefer's, Geralt's, and Ciri's, which start at different times but all coincide by the final two episodes.

Here is a timeline of the events depicted in the show:

Dates and relative position of events are taken from 3 sources:

In-show dialogue:

^{Ep.1 Ciri: You won your first battle at Hochebuz when you were my age.}

^{Ep.1 Renfri: Queen Calanthe of Cintra, she just won her first battle at Hochebuz.}

^{Ep.3 Tissaia: Princess Calanthe? Good luck with that. Word is she's even more stubborn than her father is.}

^{Note: This event occurring in 1210 contradicts the official timeline stating Calanthe was born in 1216.}

^{Ep.3-4 Yennefer: Instead, I've spent the last three decades cleaning up stupid political messes.}

^{Ep.4-5 Jaskier: What's it been, months? Years? What is time, anyway?}

^{Ep.2-5 Jaskier: Oh, are we not using "friend"? Yeah, sure. Let's just give it another decade.}

^{Ep.4-7 Geralt: I've been away twelve years and I'd planned on staying that way.}

^{Ep.7-8 Yurga: Cintran refugees, dead at least a week.}

^{Ep.8 Sabrina: It hasn't been two days yet. How is Nilfgaard's army here already?}

Showrunner's comments:

^{... Ciri's story takes place over two weeks, Yennefer's takes place over, you know, it's like 70 years. Geralt's takes place over 20 years.}

^{- Interview with tvguide.com}

^{Note that Geralt's timeline spanning 20 years does not match up with:}

<sup>1. Ep01 occurring shortly after the Battle of Hochebuz (which Calanthe won at Ciri's age ~13).
2. Pavetta being pregnant with Ciri at the Banquet at Cintra.
3. Ciri being ~13 in the present day.</sup>

^{A more reasonable timespan is around ~30 years, which coincides with the dates given in the books.}

Official Netflix timeline

1. https://www.witchernetflix.com/

2. ^{A quick crash course in the multiple timelines of The Witcher. #TheWitcher}

   

   ^{- NX - @NXOnNetflix, 10:52 AM - 7 Jan 2020}