Here's my setup:
http://www.tackleunderground.com/community/topic/17165-new-pouring-table/page__p__129929entry129929
I don't have any figures on heating times.
Yes, you have to stir while heating...not constantly. While pouring some stirring is required but not much.
I'm usually pouring laminated swimbaits so once I get the mix ready to pour heres where the real advantage kicks in...I pour the belly(s) of the bait and then that pan goes back under heat while I pour the back so I can keep pouring until I run out of plastic or mold cavities because the pan not being used is always being heated. IMO much better than putting in and out of the mwave.
I can pour 24 4.5" laminated swimbaits in minutes without stopping.
A big advantage is pouring out of pans...much easier than measuring cups...you can pour a really skinny stream.
I'm not into big production but this has worked for me since 1975. You could set up any number of stations...I used to have three but rarely used the third.
A little history...I bought what was called a "worm table" for $25 in 1975 in Mineral Wells, TX. They were home made out of cannister light fixtures and sheets of 3/4" plywood with cutouts where the pourers could get closer to the middle. They came from the American Angler lure company which sold hand poured worms...about the only kind available back then. It was owned by John Fox but he was no longer making worms by then. The plastic was heated in stainless bowls and the pourers used spoons or ladles with a spout on the side. Most pourers I was told were women. That's where I got this design and find no reason to change it. I just substituted pans for the bowls so I could pour directly.