Never heard of that one though use of crock pots is pretty common. Just make sure to match the maximum heat against the melting point of whatever the figure is made out of. I leave mine on low, and for oils it is usually less than thirty minutes to dry depending upon the colors used.
I don’t paint in oils, but I have a food dehydrator that I used for scale model cars painted with enamels. Enamels are notoriously slow to dry and cure, but two days in a food dehydrator equates to about 2 weeks air dry time.
As a new figure painter, I use the dehydrator to dry figures after they are washed and before priming. It takes about an hour, or a wee bit less. And although I paint with acrylics for which a dehydrator is not really necessary, I also put my freshly painted figures in the dehydrator for an hour or so. Hey, I have to get my money’s worth!
For oil paints? I don’t know, but they are much more like enamels. Probably an overnight dehydration may be more than sufficient.
NESCO is the big name in dehydrators BUT do get one with a THERMOSTAT. The cheaper models don’t have one. I have always set the temp between 110 – 115 degrees. I have the FD-60 but take both the list and sale prices at NESCO’s site with a grain of salt. I picked a new one up on eBay for $45 including shipping several years ago.
Note also the dehydrators have stackable trays. You may need additional trays depending on the scale of the figure. Additionally, the circular ‘grate’ must be cut out from each of these trays with a pair of wire nippers, or whatever, so that your figures, if mounted, will stand in the dehydrator.