How long you can stay in?

When you wrote a large piece of calligraphy,

you have to sit so long,

because you need to contained the stable mind to finish that,

otherwise you will make some mistakes on your paper-

whatever the size was,or the position was,or the power was,

or your chi(breath) was.

It must be the "ONE"

so you need to be the "ONE" too-

You could sit longer,

the "ONE" will be stronger.

TaiChi-Calligraphy Modern Image in my mind...︿︿