It really doesn't take but a few minutes more than scooping out dry feed. I can't free feed here anyway; the sparrows and doves eat more than the chickens do so I feed in the morning and the afternoon. Since I started fermenting I scoop some out for the first pen; usually this is from the top and a little drier so doesn't need a lot of draining. I dump it in the bucket then fill my strainer with wetter stuff and leave it to drain while I go feed the first bunch. After feeding I add some scoops of dry feed/grain, sometimes greens, stir it up, add a little water if needed and I'm done. Some folks, feeding in larger quantities use two buckets that fit inside each other. Top bucket has dozens of tiny holes drilled in the bottom and is where the feed is put/ Bottom bucket holds the liquid. When they are going to feed they pull the top bucket up so the bottom of it clears the liquid in the bottom bucket and leave to drain a few minutes (most of these folks have a rope or chain from the ceiling for the bucket to hang from) then scoop out the feed.
Some of those that kept careful records of feeding FF vs non for their meat birds report 25% or more savings in feed, faster feathering, better health, more active ( even cornish x!) and the one thing they ALL report- NO STINK! One fellow fed three groups; dry mash only, fermented mash, and a fermented mash and whole grain mix. The chicks on FF grew better and put on more weight than the dry mash only. The ones getting fermented mash and whole grain actually grew slower and dressed out lighter; probably because the whole grains knocked back the overall protein level.
With it looking like I"ll have chicks in the house all winter, the no stink was a big factor, along with the feed savings. I'd really like my chicken addiction to pay it's way and that would certainly make the difference in at least breaking even or going in the hole.
time will tell 
