ずうっと
ずうっと · zuutto · JLPT N2 · adverb
all the time
ずっと (long time) + う lengthening = stretched-out 'all the time'; zuutto drags the vowel like a long wait
ずうっと is an emphatic form of ずっと: the extra う stretches the vowel, adding intensity. Use it for 'all the way' distances or 'all the time' durations.