I've been working a blanket for a customer for ages. I was beginning to doubt my speed levels, and then I did some counting.
There's 52 squares joined in three needle cast off, so first I pick up the stitches along one side, then the other side then cast them off together. So each stitch is worked three times, and there are at least 15 stitches per side, closer to 35 on the larger squares. That's a lot of stitches to knit. I felt somewhat better about my abilities.
Then I did another count and realised I've sewn in around 221 ends, and now I'm feeling much better.