I’ve felted a total of 4 things - 2 lambs and 2 pairs of clogs and everything felted very quickly for me, some less than one agitation cycle. Maybe our apt. rental washer is just really good at felting? LOL All I know is that if I check for size and it’s still a little big, I can’t leave it in 5 minutes; more like 2 minutes! Our water gets REALLY REALLY hot here, so maybe that has something to do with it.
My process for felting is this:
Stick the felted item in a pillowcase (since I don’t have any zippered ones, I just use a big old rubber band to close it. LOL). Set the washer on “small” load, hot water, and “heavy” agitation. Throw the pillowcase in there, add a bit of detergent (like Kelly said, not too much or you’ll have a rave scene on your hands!) and check in 10 minutes. I threw in a pair of jeans with the first lamb I did, but I never need it. My felting is ultra fast!
I’m going to hate giving up this washer when we move from this apt. The dryer is slow and I could do with a different one, but the washer is GREAT!