If you have a well chosen password and it is that long, knowing how long your password is won't be enough for the office snoop to crack the password. I'd be more worried about the camera watching which keys I'm pressing.

On the other hand, if I start typing my password too soon after the login box appears on my laptop, it eats the first character. I would never have worked out why I was finding it so hard to login if the password box did not display bullets. (See also dodgy keyboards.)