This is my third Habitat by Brooklyn Tweed. If it hasn't become apparent by now, I love this pattern. This time it only took me about a week to knit, although I had to knit it almost twice. I started with a left-over ball of Princess in a beautiful orange-red -- I had just a little less than one ball, maybe about 130 yards where the pattern calls for 135 yards for the M/L size. I ran out of yarn with just about half an inch left of the crown. So I ripped the whole thing out and knit the S/M size. I had about two yards of yarn left.
I won't say I regret my effort at economy -- after all, I ended up with another hat and absolutely no wasted yarn! The only downside was I lost about a week's worth of knitting time.