Countless was a little under 2000 people (at least as far as Harris is concerned) That's about half of what her predecessor in the same office did over roughly the same time period.

Now, that conviction is for "possession, sale, or cultivation". Most paid a fine rather than serve jail time. We also don't know the exact breakdown of possession vs sale vs cultivation.

We also know that Harris pushed for decriminalization and legalization in California, and has pushed some of the same as vice president. I think Joe is the roadblock there, even if he was convinced to pardon a bunch of people for simple possession.