Question about a sentence: "You can only ... so many ..."

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Feb 08th 2012 22:02 question
What is the meaning of this sentence?:
"I can only do so many things in one day."

I think this means "There is a limitation on the number of things that I can do in one day." Is this right?

Another example from the Internet:
"I hate how you can only fit so many letters in making a fan page."
What does this mean?

Thanks!