katakana uses the small versions of the var character to make digraphs outside of those used in japanese.
they will still be pronounced for the same duration as all the other Syllables.
If you say that something will happen for the duration, you mean that it will happen for as long as a particular situation continues. [PHR after v] 直到…结束;在整个…期间；
His wounds knocked him out of combat for the duration.
他的伤病使他在整个期间都无法参赛。