Natyashastra

siva.sh/natyashastra/12/32

ज्येष्ठे चतुष्कलं ह्यत्र मध्यमे द्विकलं भवेत् । द्विकला चोत्तमे यत्र मध्ये त्वेककला भवेत् ॥ ३२॥

sanskrit

Here, the gait of the superior is four Kalās, that of the middling is two Kalās, and that of the inferior is one Kalā.

english translation

jyeSThe catuSkalaM hyatra madhyame dvikalaM bhavet | dvikalA cottame yatra madhye tvekakalA bhavet || 32||

hk transliteration by Sanscript