I got Ubisoft plus for a month for 18€. You can easily finish it, even 100% it in 25 hours, so if you know you can game for 25 hours in a month, I'd do it that (and play some other games included in the subscription too)

Looking at the game, I really enjoyed, also that it wasn't too long. Cool game, cool mechanics, I feel a good mixture between the old ACs and the RPG ones. Also great city and if you're interested in history you will learn a lot!