James Betker in the tortoise-tts repo, which is similar, says he spent $15k for his home rig. I'm not finding right now how long it took to train the tortoise model but feel like I read him say weeks/months somewhere. Obvs all kinds of variations depending on coding efficiency and dataset size, but another datapoint
https://nonint.com/2022/05/30/my-deep-learning-rig/https://github.com/neonbjb/tortoise-tts