What doed this mean?

[Unregistered]

Hello~

"she clasped her hands and smiled a smile from here to Sunday."

from here to Sunday??

I don't get it very well..
Could you tell me about the meaning?

[Casiopea]

Sunday refers to a day of the week. A week is seven days in length. And if it's, say, Monday, then Sunday is a long stretch of time away, isn't it? In other words, her smile stretched fairly wide across her face. It was a big smile. She was very happy.