cháng​chángzhǎng​cháng

very long

长长 長長 cháng​cháng frequency
very long adjective
used for emphasis or description, particularly in literary or casual reduplication to describe something quite long
长长 長長 zhǎng​cháng
to grow longer
to grow or lengthen over time

Frequency

Movie subtitles
1.04 per million appears in 0% of films
Written text
10.8 per million

Sources