Fly sparge timing

[Luckbonfire]

I’ve seen fly sparge time range from 20 minuets to over an hour.
What is the optimum fly sparge time?

 

[Ozarks Mountain Brewery]

I fly sparge and mine varies depending on how well you set the valves, it can be tricky so I don't set an actual time but the goal is an hour, but its done when its done for me,

 

[J A]

I don't have fine enough control since I'm using my pump to deliver the sparge water. I have to close the outlet ball valve enough so that it gets the slowest flow possible without stopping and then match my outflow from the mash tun. Best I can do is around 30 minutes.

 

[GFHomebrew]

Would it be that your fly sparging to get your preboil wort volume into kettle? Thats how i sparge a set amount to get a set preboil volume.

 

[Luckbonfire]

I’m reading that a quart per minute is a good rule of thumb. Thoughts?

 

[J A]

I’m reading that a quart per minute is a good rule of thumb. Thoughts?

My rate is less. I do an infusion for dextrine rest and mash-out so my sparge on a typical 5-gallon batch (7 to 7.5 pre-boil) is around 13 quarts. Ideally, that takes at least 20 minutes before all the sparge water has hit the tun. Then it continues to drain slowly for another 10 minutes or so until the grain bed is relatively dry.