Vivian,
Please don't let my packing progress scare you. I work 10-14 hour days being self employed and packing at last minute is not an option. I have to prepare my work to so I can be gone for more than two weeks. Besides, it's fun to think about leaving. I think for as long as you are traveling, you can pack to 10 days and recycle and launder. For 10 days crusing and 4 days land (London) I am still figuring out what to bring.
Those formal and informal nights are luggage intensive!