He mentions the Colab for Dreambooth, that only takes ten minutes or so to train using an A100 (the premium GPU) and you can have it turn off after it finishes, and saves to Google Drive. Super easy.

Here's the colab notebook, in case anyone is interested: https://github.com/TheLastBen/fast-stable-diffusion

I've trained a few smaller models using their Dreambooth notebook, but I think for 4000 training steps, an A100 will usually take 30-40min. I believe replicate also uses A100s for their dreambooth training jobs.