寸時 is read as すんじ (sunji) and means moment.
すんじ
sunji
すんぽう
measurement
すんぜん
just in front of
すんか
moment's leisure
すんだん
cutting to pieces
すんげき
short play
すん
sun (approx. 3.03 cm)
すんぽうきにゅう
dimensioning
すんぶんたがわず
without the least difference
すんぶんたがわぬ
exactly the same
すんぶん
tiny bit
すんち
an inch of ground
すんかん