How long do you kettle sour?

[Infected]

I started my first kettle sour, a sour saison. How long should I let it go for?
I used unmilled pilsner malt for the lacto and have it on my stove top on low which is holding it about 116* f. How long have you guys let it go for with good results?

 

[tagz]

Usually 24-72 hours. But that's a long time to have your burner going... You also have to keep the oxygen out. Most people use Saran Wrap. Using grains to sour is a fairly unpredictable route.

 

[Infected]

It has a crazy pellicle and smells clean, no nasty smells.