I don't know about you, but I know I've wished for two of me more times than I can number. I want one of me to be the great mom and take care of the house and do everything I want to in order to take care of and educate my children, and another one to work and do all the things that I (as my own individual person) want to do with my life. I pray each day to do what God wants with that day, and I do manage to squeeze a lot out of each one, but I almost always wish that I had more time for me, and I am always exhausted. Needless to say, I struggle with acceptance.
Patti Maguire Armstrong (mom of 10!) has written a very insightful article: Making Peace with the 24 Hour Day, which offers some suggestions for getting more out of your day as well as accepting what you do manage to accomplish.