How fast do these things heat up? I'm just now using one for the first time, and I've had it on for about an hour, but I don't really feel anything heating up when I put my hand to it.
Purchased this model: http://www.midwestsupplies.com/fermwrap-heater.html
Thanks
Purchased this model: http://www.midwestsupplies.com/fermwrap-heater.html
Thanks