Running hot after partial coolant change

This morning when I started up the car to leave work, I removed the cap and let it idle. Got up to 190*, then it backed down just a hair, then back up to 190*. I watched the filler neck for bubbling or burping or any activity. Nothing except a bit of steam coming off the hot coolant. The level remained the same at full. Drove it home and the temp hovered around 210. How long should I expect it to take for the air to be expelled? I'll give it another go now that I'm home and can take a little more time.

At any rate, I've got bigger fish to fry. I noticed a ticking from the driver side valve cover and it sounds like I've got a cylinder missing. oh boy.