I am setting up the space after a period.
From the context manual, it is said that
"Default a space is placed after a period that ends a sentence. In some
countries it is custom to stretch the space after a period. ... One can
however change this spacing

\setupspacing[...]
...broad packed

if this argument is set as 'broad', what is the exact space? Let's say I
want two spaces after the period, how to set this?