Slow & Low?

[dripdripdrip]

I keep hearing this term and am wondering what exactly this means...

Slow meaning the length of time of the run, I'm guessing? Low meaning the temp during the run, I'm guessing?

We are about to run a Bourbon mash through a pot still and from NCHooch's suggestion, should try for 60% slow and low.

If we are running a 20L wash through a pot still, how slow should we go (on average), meaning, how long should we let the still run for? We aren't pulling heads and tails on the stripping run and we have a 1500W hot plate.

Should we be tweaking the temp on the hot plate to keep it at a certain temp or should we leave it alone? Also, how will we know when all the tails have come off?

Thanks in advance.