I've been doing some experimental off-season indoor gardening to beat winter depression. I planted sweet potato slips on October 28. For reference, they're supposed to be planted in the spring, about a month after the last frost.

Conditions: Southern California, indoors, out of season, temperature controlled to the low 70s Fahrenheit, light and warmth comes from a south-facing frosted glass door.
I've been relying on ChatGPT for guidance. Here is what ChatGPT said when pushed to give a probability:

I will attempt to harvest on a day in the window of February 5 - February 25, which corresponds to a range of 100-120 days after planting. I will select for signs of readiness (withering/yellowed vines, loosened soil) when picking the day.

If I find any edible sweet potatoes (regardless of number or size) when I dig, this question resolves YES.
If there are no tubers to be found, or if they are rotten, this question resolves NO.

I will provide a photo of the results!