योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-52, verse-18

कदाचिदष्टौ वर्षाणि दश द्वादश वापि च ।
कदाचित्पञ्चसप्तादि कदाचित्षोडशापि च ॥ १८ ॥

kadācidaṣṭau varṣāṇi daśa dvādaśa vāpi ca ,
kadācitpañcasaptādi kadācitṣoḍaśāpi ca 18

18. kadācit aṣṭau varṣāṇi daśa dvādaśa vā api ca
kadācit pañca-saptādi kadācit ṣoḍaśa api ca

18. kadācit aṣṭau varṣāṇi,
daśa vā dvādaśa api ca,
kadācit pañca-saptādi,
kadācit ṣoḍaśa api ca

18. Sometimes for eight years, ten, or even twelve; sometimes for five, seven, or similar durations; and sometimes for as many as sixteen years.

Words meanings summery:

• कदाचित् (kadācit) - sometimes, at some time, perhaps

• अष्टौ (aṣṭau) - eight

• वर्षाणि (varṣāṇi) - years (duration) (years, rainy seasons)

• दश (daśa) - ten

• द्वादश (dvādaśa) - twelve

• वा (vā) - or, either

• अपि (api) - also, even, too, and

• च (ca) - and, also

• कदाचित् (kadācit) - sometimes, at some time, perhaps

• पञ्च-सप्तादि (pañca-saptādi) - five, seven, etc., beginning with five and seven

• कदाचित् (kadācit) - sometimes, at some time, perhaps

• षोडश (ṣoḍaśa) - sixteen

• अपि (api) - also, even, too, and

• च (ca) - and, also

Words meanings and morphology

कदाचित् (kadācit) - sometimes, at some time, perhaps

(indeclinable)

अष्टौ (aṣṭau) - eight

(numeral)

वर्षाणि (varṣāṇi) - years (duration) (years, rainy seasons)

(noun)

Nominative, neuter, plural of varṣa

varṣa - rain, year, rainy season, cloud

Root: vṛṣ (class 1)

दश (daśa) - ten

(numeral)

द्वादश (dvādaśa) - twelve

(numeral)

वा (vā) - or, either

(indeclinable)

अपि (api) - also, even, too, and

(indeclinable)

च (ca) - and, also

(indeclinable)

कदाचित् (kadācit) - sometimes, at some time, perhaps

(indeclinable)

पञ्च-सप्तादि (pañca-saptādi) - five, seven, etc., beginning with five and seven

(adjective)

Nominative, plural of pañca-saptādi

pañca-saptādi - five, seven, and so on; beginning with five and seven

Compound type : dvandva-tatpuruṣa (pañcan+saptan+ādi)

• pañcan – five
  numeral
• saptan – seven
  numeral
• ādi – beginning, and so on, etcetera
  noun (masculine)

कदाचित् (kadācit) - sometimes, at some time, perhaps

(indeclinable)

षोडश (ṣoḍaśa) - sixteen

(numeral)

अपि (api) - also, even, too, and

(indeclinable)

च (ca) - and, also

(indeclinable)