Skandapurana 16.319.40

16.319.40

trirātraṃ paṃcarātraṃ vā saptarātraṃ maheśvara ..
pakṣaṃ māsamṛtuṃ vāpi hyayanaṃ yāvadeva ca ..
putradārayutaistīrthe vastavyaṃ gṛhamedhibhiḥ .. 7.1.319.40 ..

For three nights, or five nights, or seven nights, O Maheśvara, / a fortnight, a month, a season, or even up to a half-year: / for so long may householders dwell at a sacred ford accompanied by sons and wives.