Originally Posted by mtkeller

I tend to be the type of person who reads a lot in museums/historic sites, so that tends to make me move slower than some people. However, the friend who went to Bletchley Park with me is a faster museum mover and he still felt rushed with four hours.

I find lots of things at the Tower of London fascinating, and since I have a membership, I'm maximizing its value The arms and armor bit wasn't terribly great, from my perspective, and that did eat up some time when I was there with some visitors. However, if you're interested in learning about some of the famous "residents" and seeing where they literally made their mark on some of the walls, you can spend a lot of time perusing areas with pretty good information provided. I'd definitely say see what you're interested in and then ask advice about how long it will take (and queuing times).