How much can we do in one day?

Just a few days ago, I caught up on all of my laundry.  I had bags and bags of it all over the house that needed to be folded.  I finally set out to get it managed and put away.

I played with my son.
I fed my son.
I snuck in invoicing two clients while I was hanging outside with my son.
While he was asleep, I did some laundry, and put some gluten, dairy and yeast free bread in the oven, I recorded and edited a voiceover, I wrote a proposal for a voiceover and sent it out.
Then I paid some bills and all the while I kept an eye on Freecycle to see if there is anything we needed on there.  I actually got to take a nice long shower and shave and then he woke up.

I also helped a friend with her grant proposal, by editing and giving her some tips.  This I did twice during the day.
I played with my son some more and fed him some more.
All throughout the day I worked with my son on Potty Training and changed soiled diapers.
I also cleaned dishes, took care of the garden and cleaned up toys.  I also entered sweepstakes and tried to catch up with friends on facebook.

By the evening I was exhausted.  How much can we do in one day?